Porcine retrovirus

ABSTRACT

The present invention provides porcine retrovirus (PoEV) polynucleotide fragments, particularly those encoding at least one PoEV expression product, a recombinant vector comprising such a polynucleotide fragment or fragments, use of PoEV polynucleotide fragments in the detection of native PoEV, a host cell containing at least one PoEv polynucleotide fragment or recombinant vector, PoEV polypeptides, antibodies immuno-reactive with PoEV polypeptides, pharmaceutical compositions comprising recombinant PoEV polypeptides for use as prophylactic and/or therapeutic agents and uses of PoEV polynucleotide fragments and/or polypeptides in medicine, including veterinary medicine and in the preparation of medicaments for use in medicine.

BACKGROUND OF THE INVENTION

The present invention relates inter alia to porcine retrovirus (PoEV) fragments, in particular polynucleotide fragments encoding at least one porcine retrovirus expression product, a recombinant vector comprising at least one polynucleotide fragment, use of PoEV polynucleotide fragments in the detection of native porcine retrovirus, a host cell containing at least one PoEV polynucleotide fragment or a recombinant vector comprising at least one PoEV polynucleotide fragment, PoEV polypeptides, antibodies immuno-reactive with PoEV polypeptides, pharmaceutical compositions comprising recombinant PoEV polypeptides for use as prophylactic and/or therapeutic agents and uses of PoEV polynucleotide fragments and/or polypeptides in medicine, including veterinary medicine and in the preparation of medicaments for use in medicine, including veterinary medicine.

Porcine retrovirus (PoEV) is an endogenous (genetically acquired) retrovirus isolated from pigs and expressed in cell lines derived from porcine material. There are no known pathogenic effects associated with the virus per se in its natural host although the virus appears to be associated with lymphomas in pigs and related viruses are associated with leukaemias and lymphomas in other species. The virus has been reported to infect cells from a variety of non-porcine origins and is, therefore, designated as a xenotropic, amphotropic or polytrophic virus (Lieber M M, Sherr C J. Benveniste R E and Todaro G J. 1975; Strandstrom H, Verjalainen P, Moening V, Hunsmann G, Schwarz H, and Schafer W. 1974; Todaro G J, Benveniste R E, Lieber M M and Sherr C J. 1974). The observation that the above viruses may have the potential to infect humans and have a pathogenic effect suggests that the issue of porcine retroviruses must be addressed in the context of xenotransplanting pig tissues or cells. Therefore, information on the properties of PoEV and the development of diagnostic reagents, molecular engineering tools and potential vaccine materials is of paramount importance for example in xenotransplantation technology and the like.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a nucleic acid sequence from a cDNA isolated from PoEV having the sequence of SEQ ID NO: 1.

FIG. 2 shows a nucleic acid sequence from a cDNA isolated from PoEV having the sequence of SEQ ID NO: 2.

FIG. 3 shows a nucleic acid sequence from a cDNA isolated from PoEV having the sequence of SEQ ID NO: 3. Also depicted are the amino acid sequences produced by the 3 ORFs encoded by SEQ ID NO: 3 including (i) the gag gene encoding for a polypeptide having the amino acid sequence of SEQ ID NO: 4 (corresponding to nucleotides 588-2162 of SEQ ID NO: 3); (ii) the pol gene encoding for a polypeptide having the amino sequence of SEQ ID NO: 5 (corresponding to nucleotides 2163-5747 of SEQ ID NO: 3); and (iii) the env gene encoding for a polypeptide having the amino sequence of SEQ ID NO: 6 (corresponding to nucleotides 5620-7590 of SEQ ID NO: 3).

FIG. 4 (top) shows a list of changes to the PoEV nucleic acid sequence (as compared to the sequence depicted in FIG. 3) which were found in PoEV DNA isolated from PoEV infected Raji cells. The bottom half shows a list of changes to the ENV polypeptide (as compared to the sequence depicted in FIG. 3) resulting from the nucleotide changes shown in the top half of the figure. SEQ ID NO: 9 is a nucleic acid sequence corresponding to nucleotides 5260-8210 of SEQ ID NO: 3 and containing the specified modifications. SEQ ID NO: 10 is an amino acid sequence corresponding to the ENV polypeptide of SEQ ID NO: 6 and containing the specified modifications.

FIG. 5 shows a phylogenetic tree for the POL polypeptide.

FIG. 6 the nucleotide sequence for a portion of the PoEV genome corresponding to the U3 region and depicting the multiple potential transcription sites located therein (SEQ ID NO: 17).

DETAILED DESCRIPTION OF THE INVENTION

It is an objected of the present invention to obviate and/or mitigate against at least some of the above disadvantages.

In one aspect the present invention provides an isolated PoEV polynucleotide fragment:

(a) encoding at least one porcine retrovirus (PoEV) expression product;

(b) encoding a physiologically active and/or immunogenic derivative of said expression product; or

(c) which is complementary to a polynucleotide sequence as defined in (a) or (b)

Preferably, the polynucleotide fragment encodes the gag gene (gag), polymerase gene (pol) and/or envelope (env) gene of PoEV. Thus, said expression product can be the virion core polypeptides (GAG) and polymerase (POL) and/or envelope (ENV) polypeptides of PoEV. Thus, the invention further provides a recombinant PoEV virion core, polymerase and/or envelope polypeptide.

“Polynucleotide fragment” as used herein refers to a chain of nucleotides such as deoxyribose nucleic acid (DNA) and transcription products thereof, such as RNA. Naturally, the skilled addressee will appreciate the whole naturally occurring PoEV genome is not included in the definition of polynucleotide fragment.

The polynucleotide fragment can be isolated in the sense that it is substantially free of biological material with which the whole genome is normally associated in vivo. The isolated polynucleotide fragment may be cloned to provide a recombinant molecule comprising the polynucleotide fragment. Thus, “polynucleotide fragment” includes double and single stranded DNA, RNA and polynucleotide sequences derived therefrom, for example, subsequences of said fragment and which are of any desirable length. Where a nucleic acid is single stranded then both a given strand and a sequence complementary thereto is within the scope of the present invention.

In general, the term “expression product” refers to both transcription and translation products of said polynucleotide fragments. When the expression product is a “polypetide” (i.e. a chain or sequence or amino acids displaying a biological and/or immunological activity substantially similar to the biological and/or immunological activity of PoEV virion core, polymerase and/or envelope protein), it does not refer to a specific length of the product as such. Thus, the skilled addressee will appreciate that “polypeptide” encompasses inter alia peptides, polypeptides and proteins of PoEV. The polypeptide if required, can be modified in vivo and in vitro, for example by glycosylation, amidation, carboxylation, phosphorylation and/or post-translational cleavage.

Polynucleotide fragments comprising portions encompassing the PoEV genome, and derived from retrovirus particles released from a reverse transcriptase-positive porcine kidney cell line PK-15, have been molecularly cloned into a plasmid vector. This was achieved by synthesising cDNAs of PoEV RNA genomes which were recovered from porcine kidney cells expressing the endogenous virus. The cDNA was cloned into a plasmid vector and the isolated PoEV DNA fragment determined (see FIGS. 1,2 and 3). The sequence of the sequence identified in FIG. 1 was the earliest determined sequence, followed by the sequence in FIG. 2 and lastly by the most recently revised sequence shown in FIG. 3. An additional study has been carried out to determine whether or not the human cell line “Raji” was susceptible to infection with the PoEV present in porcine kidney calls (PK15). A raji clone has now been obtained and the DNA sequence of its any gene region has been determined (see FIG. 4).

The DNA fragment of FIG. 3 was shown to encode three open reading frames (ORFs) of 524, 1194 and 656 amino acids respectively.

A comparison of the amino acid sequence against previously sequenced retroviruses from other species indicated that novel retrovirus cDNA had been cloned. Sequence analysis using the Lasergene software from DNASTAR Inc. showed that homologies were observed between the cloned PoEV DNA and the majority of retroviruses and that the closest homologies were to gibbon leukaemia virus (GaLV) in the polymerase (pol) and (env) regions of the pro-virus.

The first open reading frame ORF of FIG. 3 (nucleotides 588-2162) is predicted to encode the PoEV virion core polypeptide (gag gene). The second ORF (nucleotides 2163-5747) is predicted to encode the PoEV polymerase polypeptide (pol gene). The third ORF (nucleotides 5620-7590) is predicted to encode the PoEV envelope polypeptide (env gene). The skilled addressee will appreciate that it is possible to genetically manipulate the polynucleotide fragment or derivatives thereof, for example to clone the gene by recombinant DNA techniques generally known in the art and to express the polypeptides encoded thereby in vitro and/or in vivo. DNA fragments having the polynucleotide sequence depicted in FIGS. 1,2,3, and/or 4 or DNA/RNA derivatives thereof, may be used as a diagnostic tool or as reagent for detecting PoEV nucleic acid in nucleic acids from donor animals or as a vaccine.

Preferred fragments of this aspect of the invention are polynucleotide fragments encoding: (a) at least one of the one to three polypeptides having an amino acid sequence which is shown in FIGS. 1,2,3 and/or 4 (b) encoding a polypeptide which is a physiologically active and/or immunogenic derivative of at least one of the polypeptides defined in (a); or (c) which is complementary to a polynucleotide sequence as defined above; or polynucleotide fragments: (a) comprising at least one of the ORFs shown in FIGS. 1,2,3 and/or 4 or comprising a corresponding RNA sequence; (b) comprising a sequence having substantial nucleotide sequence identity with a sequence as described in (a) above; or (c) comprising a sequence which is complementary to a sequence as described in (a) or (b) above. It is to be understood that the term “substantial sequence identity” is taken to mean at least 50% (preferably at least 75%, at least 90%, or at least 95%) sequence identity.

The polynucleotide fragment of the present invention may be used to examine the expression and/or presence of the PoEV virus in donor animals and cells, tissues or organs derived from the donor animals to see if they are suitable for xenotransplantation (i.e. PoEV free). In addition, the recipients of pig cells, tissues or organs can be examined for the presence and/or expression of PoEV virus directly or by co-culture or infection of susceptible detector calls.

A polynucleotide fragment of the present invention may be used to identify polynucleotide sequences within the PoEV genome which are PoEV specific (i.e. is not necessary for the complete PoEV genome to be identified). Such PoEV specific polynucleotide sequences may be used to identify PoEV nucleic acid in samples, such as transplanted cells, tissues or organs and may be included in a definitive test for PoEV.

Thus, the present invention further provides an isolated PoEV polynucleotide fragment capable of specifically hybridising to a PoEV polynucleotide sequence. In this manner, the present invention provides probes and/or primers for use in ex vivo and/or in situ PoEV virus detection and expression studies. Typical detection studies include polymerase chain reaction (PCR) studies, hybridisation studies, or sequencing studies. In principle any PoEV specific polynucleotide sequence from the above identified PoEV sequence may be used in detection and/or expression studies.

“Capable of specifically hybridising” is taken to mean that said polynucleotide fragment preferably hybridises to a PoEV polynucleotide sequence in preference to polynucleotide sequences of other virus, animal (especially porcine or human sequences) and/or other species. In a preferment the PoEV fragment specifically binds to a native PoEV polynucleotide sequence or a part thereof.

The invention includes polynucleotide sequence(s) which are capable of specifically hybridising to a PoEV polynucleotide sequence or to a part thereof without necessarily being completely complementary to said PoEV polynucleotide sequence or fragment therefor. For example, there may be at least 50% preferable at least 75%, most preferably at least 90% or at least 95% complementarity. Of course, in some cases the sequences may be exactly complementary (100% complementary) or nearly so (e.g. there may be less than 10, preferably less than 5 mismatches). Thus the present invention also provides anti sense or complementary nucleotide sequence(s) which is/are capable of specifically hybridising to the disclosed DNA sequence. If a PoEV specific polynucleotide is to be used as a primer in PCR and/or sequencing studies, the polynucleotide must be capable of hybridising to PoEV nucleic acid and capable of initiating chain extension from 3′ end of the polynucleotide, but not able to correctly initiate chain extension from non PoEV sequences (especially from human, or non-PoEV porcine sequences).

If a PoEV specific test polynucleotide sequence is to be used in hybridisation studies, to test for the presence of PoEV nucleic acid in a sample, the test polynucleotide should preferably remain hybridised to a sample polynucleotide under stringent conditions. If desired, either the test or sample polynucleotide may be immobilised. Generally the test polynucleotide sequence is at least 10 or at least 50 bases in length. It may be labelled by suitable techniques known in the art. Preferably the test polynucleotide sequence is at least 200 bases in length and may even be several kilobases in length. Thus, either a denatured sample or test sequence can be first bound to a support. Hybridization can be effected at a temperature of between 50 and 70° C. in double strength SSC (2×NaCl 17.5 g/l and sodium citrate (SC) at 8.8 g/l ) buffered saline containing 0.1% sodium dodecyl sulphate (SDS). This can be followed by rinsing of the support at the same temperature but with a buffer having a reduced SSC concentration. Depending upon the degree of stringency required, and thus the degree of similarity of the sequences, such reduced concentration buffers are typically single strength SSC containing 0.1% SDS, half strength SSC containing 0.1% SDS and one tenth strength SSC containing 0.1% SDS. Sequences having the greatest degree of similarity are those the hybridisation of which is least affected by washing in buffers of reduced concentration. It is most preferred that the sample and inventive sequences are so similar that the hybridisation between them is substantially unaffected by washing or incubation in one tenth strength sodium citrate buffer containing 0.1% SDS.

PoEV specific oligonucleotides may be designed to specifically hybridise to PoEV nucleic acid. They may be synthesised, by known techniques and used as primers in PCR or sequencing reactions or as probes in hybridisations designed to detect the presence of PoEV material in a sample. The oligonucleotides may be labelled by suitable labels known in the art, such as, radioactive labels, chemiluminescent labels or fluorescent labels and the like. Thus, the present invention also provides PoEV specific oligonucleotide probes and primers.

The term “oligonucleotide” is not mean to indicate any particular length of sequence and encompasses nucleotides of preferably at least 10 b (e.g. 10 b to 1 kb) in length, more preferably 12 b-500 b in length and most preferably 13 b to 100 b.

The PoEV specific oligonucleotides may be determined from the PoEV sequences shown in FIG. 1 and may be manufactured according to known techniques. They may have substantial sequence identity (e.g. at least 50%, at least 75%, at least 90% or at least 95% sequence identity) with one of the strands shown therein or an RNA equivalent, or with a part of such a strand. Preferably such a part is at least 10, at least 30, at least 50 or at least 200 bases long. It may be an ORF or a part thereof.

Oligonucleotides which are generally greater than 30 bases in length should preferably remain hybridised to a sample polynucleotide under one or more of the stringent conditions mentioned above. Oligonucleotides which are generally less than 30 bases in length should also preferably remain hybridised to a sample polynucleotide but under different conditions of high stringency. Typically the melting temperature of an oligonucleotide less than 30 bases may be calculated according to the formula of; 2° C. for every A or T, plus 4° C. for every G or C, minus 5° C. Hybridisation may take place at or around the calculated melting temperature for any particular oligonucleotide, in 6×SSC and 1% SDS. Non specifically hybridised oligonucleotides may then be removed by stringent washing, for example in 3×SSC and 0.1% SDS at the same temperature. Only substantially similar matched sequences remain hybridised i.e. said oligonucleotide and corresponding PoEV nucleic acid.

When oligonucleotides of generally less than 30 bases in length are used in sequencing and/or PCR studies, the melting temperature may be calculated in the same manner as described above. The oligonucleotide may then be allowed to anneal or hybridise at a temperature around the oligonucleotides calculated melting temperature. In the case of PCR studies the annealing temperature should be around the lower of the calculated melting temperatures for the two priming oligonucleotides. It is to be appreciated that the conditions and melting temperature calculation are provided by way of example only and are not intended to be limiting. It is possible through the experience of the experimenter to vary the contritions of hybridisation and thus anneal/hybridise oligonucleotides at temperatures above their calculated melting temperature. Indeed this can be desirable in preventing so-called non-specific hybridisation from occurring.

It is possible when conducting PCR studies to predict an expected size or sizes of PCR product(s) obtainable using an appropriate combination of two or more PoEV oligonucleotides, based on where they would hybridise to the sequence in FIG. 1. if, on conducting such a PCR on a sample of PoEV DNA, a fragment of the predicted size is obtained, then this is predictive that the DNA is PoEV.

The present invention also encompasses PoEV detection kits including at least one oligonucleotide which is PoEV specific, as well as any necessary reaction reagents, washing reagents, detection reagents, signal producing agents and the like or use in the test formats outlined above.

In a further aspect there is also provided use of a PoEV specific polynucleotide in the detection of PoEV in a sample.

In a yet further aspect there is provided use of a PoEV specific polynucleotide in a PCR for the detection of PoEV in a sample.

The skilled addressee will appreciate how polynucleotide fragments may be designed and used as primers/probes in polymerase chain reaction (PCR) experiments or Southern analysis (i.e. hybridisation studies) for detecting the presence or otherwise of PoEV polynucleotide in the nucleic acid of pigs or in cell, tissue or organ samples taken from pigs (e.g. from potential transplant organs such as liver, kidney and heart). Such cells, tissues or organs can be derived from transgenic animals produced as described in EP-A-0493852, or by other means known in the art. Thus the cells, tissues or organs of transgenic pigs can be associated with one or more homologous complement restriction factors active in humans to prevent/reduce activation of complement.

Furthermore the polynucleotide fragments of the present invention can be used to analyze the genetic organisation of endogenous PoEV located in the animal cell genome in pigs thus permitting the screening of herds of pigs for altered provirus and genomic loci (e.g. non-expressed provirus loci). Such a screening method would facilitate, for example, screening in a population of animals which are bred to lack expressed provirus and genomic loci and/or loci that do not encode infectious virus particles.

Reagents may also be developed from said polynucleotide fragments as aids to develop pigs that do not express an infectious, PoEV capable of infecting humans. Such pigs could still contain partial defective genomes that could result in the expression of non-infectious particles, viral proteins or viral mRNA. Alternatively, it may be possible to use constructs derived from the PoEV polynucleotide sequence to act as insertional mutagens to knockout the productive infectious PoEV in embryos, embryonic stem cells, or cells containing totipotential nuclei capable of forming a viable embryo. Thus qag, pol and/or env gene “knockouts” may be constructed to allow development of breeding programs in pigs whereby endogenous PoEV is substantially prevented or reduced. For example the nucleotide sequence of PoEV can be manipulated e.g. by deletion of a coding sequence in vitro and the resulting construct used to replace the natural PoEV sequence by recombination. Thus, the proviral genome can be rendered inactive in the porcine cells. The knockouts can be manipulated into embryos and/or stem cells and if required manipulated nuclei can be transferred from target cells to germ cells using micromanipulation techniques well known in the art. The invention also extends to animals derived from such germ cells.

Thus, transgenic pigs may be produced containing anti-sense constructs and/or ribozyme constructs capable or downregulating the expression of viral proteins, or transgenic pigs expressing a single chain immunoglobulin molecule with specificity for PoEV proteins or other protein that might interfere with protein synthesis or viral assembly may also be produced. Similar transgenes encoding trans-dominant negative regulators of PoEV expression or transgenes encoding competitive defective “genomic RNAs” may be used to reduce or eliminate the production of infectious virions. The generation of reagents to suppress the expression of native PoEV loci in pigs, such as, by generation of antisense nucleic acids (e.g. antisense mRNAs), ribozymes or other antiviral reagents may also be developed.

The polynucleotide fragment can be molecularly cloned into a prokaryotic or eukaryotic expression vactor using standard techniques and administered to a host. The expression vector is taken up by cells and the polynucleotide fragment of interest expressed, producing protein. Presentation of the protein on cell surface stimulates the host immune system to produce antibodies immunoreactive with said protein as part of a defence mechanism. Thus, expressed protein may be used as a vaccine.

Inactivated vaccines can be produced from PoEV's or cells releasing PoEV. Such infected cells may be generated by natural infection or by transfection of a proviral clone of PoEV. It will be understood that a proviral clone is a molecular clone encoding on a least one antigenic polypeptide of PoEV. After harvesting the virus and/or the infected cells, viruses or infected cells present can be inactivated for example, with formaldehyde, gluteraldehyde, acetylethylenimine or other suitable agent or process to generate an inactivated vaccine using methods commonly employed in the art. (CVMP Working Party on Immunological Veterinary Medicinal Products (1993). General requirements for the production and control of inactivated mammalian bacterial and viral vaccines for veterinary use). Sub unit vaccines may be prepared from the individual proteins encoded by the gag, pol and env genes. Typically a vaccine would contain env gene products either alone or in combination with gag genes produced by expression in bacteria, yeast or mammlian cell systems.

Proviral clones of PoEV can be engineered to develop single cycle or replication defective viral vectors suitable for vaccination using techniques. Such viral vectors known in the art (e.g. MuLV Murine Leukaemia Retrovirus, Adenovirus and Herpesviruses (Anderson W F. (1992). Human Gene Therapy. Science 256, 808-813) may have one or more genes essential for replication deleted, with the missing gene function expressed constitutively or conditionally from a further, different construct which is integrated into the chromosomal DNA of a complementing cell line to the proviral PoEV clone. PoEV virions released from the cell line may infect secondary target cells in the vaccine but not produce further infectious virus particles. For instance, the polynucleotide sequence encoding the reverse transcriptase domain of pol can be deleted from the proviral PoEV clone and the reverse transcriptase domain of pol integrated into the complementing cell line.

It will be understood that the polynucleotides; polypeptides; PoEV free cells, tissues and/or organs encompassed by the present invention could be used in therapy, diagnosis, and/or methods of treatment. The polynucleotides; polypeptides; PoEV free cells, tissues and/or organs encompassed by the present invention can also be used in the preparation of medicaments for use in therapy or diagnosis.

The cloning and expression of a recombinant PoEV polynucleotide fragment also facilitates in producing anti-PoEV antibodies and fragments thereof (particularly monoclonal antibodies) and evaluation of in vitro and in vivo biological activity of recombinant PoEV polymerase and/or envelope polypeptides. The antibodies may be a employed in diagnostic tests for native PoEV virus.

It will be understood that for the particular PoEV polypeptides embraced herein, natural variations can exist between individuals or between members of the family Suidae (i.e. the pig family ). These variations may be demonstrated by (an) amino acid difference(s) in the overall sequence or by deletions, substitutions, insertions, inversions or additions of (an) amino acid(s) in said sequence. All such derivations showing active polymerase and/or envelope polypeptide physiological and/or immunological activity are included within the scope of the invention. For example, for the purpose of thee present invention conservative replacements may be made between amino acids within the following groups:

(I) Alanine, serine, threonine;

(II) Glutamic acid and aspartic acid;

(III) Arginine and leucine;

(IV) Asparagine and qlutamine;

(V) Isoleucine, leucine and valine;

(VI) Phenylalanine, tyrosine and tryptophan

Moreover, recombinant DNA technology may be used to prepare nucleic acid sequences encoding the various derivatives outlined above.

As is well known in the art, the degeneracy of the genetic code permits substitution of bases in a codon resulting in a different codon which is still capable of coding for the same amino acid, e.g. the codon for amino acid glutamic acid is both GAT and GAA. Consequently, it is clear that for the expression of polypeptides with the amino acid sequences shown in FIG. 1 or fragments thereof, use can be made of a derivative nucleic acid sequence with such an alternative codon composition different from the nucleic acid sequence shown in said FIG. 1.

Furthermore, fragments derived from the PoEV core, polymerase and/or envelope polypeptides as depicted in FIG. 3, which still display PoEV virus core polypeptide, polymerase and/or envelope polypeptide properties, or fragments derived from the nucleic acid sequence encoding the virus core polypeptides, polymerase and/or envelope polypeptides or derived from the nucleotide sequence depicted in FIGS. 1,2,3 and/or 4 encodinq fragments of said virus core polypeptide, polymerase and/or envelope polypeptides are also included of the present invention. Naturally, the skilled addressee will appreciate within the ambit that the said fragments should substantially retain the physiological and/or immunological properties of the GAG, POL and/or ENV polypeptides.

The PoEV polynucleotide fragment of the present invention is preferably linked to requlatory control sequences. Such control sequences may comprise promoters, operators, inducers, enhancers, ribosome binding sites, terminators etc. Suitable control sequences for a given host may be selected by those of ordinary skill in the art.

A polynucleotide fragment according to the present invention can be ligated to various expression controlling sequences, resulting in a so called recombinant nucleic acid molecule. Thus, the present invention also includes an expression vector containing an expressible PoEV nucleic acid molecule. The recombinant PoEV nucleic acid molecule can then be used for the transformation of a suitable host. Such hybrid molecules are preferably derived from, for example, plasmids or from nucleic acid sequences present in bacteriophages or viruses and are termed vector molecules.

Specific vectors which can be used to clone nucleic acid sequences according to the invention are known in the art (e.g. Rodriguez, R. L. and Denhadt, D. T., edit., Vectors: a survey of molecular cloning vectors and their uses, Butterworths, 1983).

The methods to be used for the construction of a recombinant nucleic acid molecule according to the invention are known to those of ordinary skill in the art and are inter alia set forth in Sambrook, et al. (Molecular Cloning: a laboratory manual Cold Spring Harbour Laboratory, 1989).

The present invention also relates to a transformed cell containing the PoEV polynucleotide fragment in an expressible form. “Transformation”, as used herein, refers to the introduction of a heterologous polynucleotide fragment into a host cell. The method used may be any known in the art, for example, direct uptake, transfection transduction or electro poration (current Protocols in Molecular Biology, 1995. John Wiley and Sons Inc). The heterologous polynucleotide fragment may be maintained through autonomous replication or alternatively, may be integrated into the host genome. The recombinant nucleic acid molecules preferably are provided with appropriate control sequences compatible with the designated host which can regulate the expression of the inserted polynucleotide fragment, e.g. tetracycline responsive promoter thymidine kinasa promoter, SV-40 promoter and the like.

Suitable hosts for the expression of recombinant nucleic acid molecules may be prokaryotic or eukaryotic in origin. Hosts suitable for the expression of recombinant nucleic acid molecules may be selected from bacteria, yeast, insect cells and mammalian cells.

Since the biological half life and the degree of glycosylation of recombinant PoEV virus core polypeptide, polymerase and/or envelope polypeptides may be important for use in vivo, yeast and baculovirus systems, in which a greater degree of processing and glycosylation occur, are preferred. The yeast strain Pichia Pastoris exhibits potential for high level expression of recombinant proteins (Clare et al., 1991). The baculovirus system has been used successfully in the production of type 1 interferons (Smith at al., 1933).

Embodiments of aspects of the present invention will now be described by way of example only which are not intended to be limiting thereof.

EXAMPLES SECTION Example 1

Preparation of Viral RNA

500 ml of supernatant derived from exponentially growing porcine kidney cells (PK-15, American Type Culture Collecticn CCL 33) was clarified by centrifugation of approximately 11, 000×g for 10 minutes. Virus was pelleted from the clarified supernatant by centrifugation at approximately 100,000×g or 60 minutes. The supernatant was discarded and the viral pellet retained for the preparation of viral RNA genomes. RNA was prepared from the virus pellet using a Dynabeads (registered trade mark) mRNA Direct kit according to the manufacturer's protocols; A PoEV virus pellet was resuspended in 500 μl of TNE (10 mM Tris HCl pH8.0, 0.1M NaCl, 1 mM EDTA) and the virions disrupted by the addition of 2 ml of lysis/binding buffer Dynabeads Oligo(dT)₂₅ were conditioned according to the manufacturer's instructions and added to the virus disrupted solution. Viral RNA was allowed to bind to the Dynabead for 10 minutes before the supernatant was removed and the bound RNA was washed three times with washing buffer with LiDS (0.5 ml) and twice with washing buffer alone. The RNA was finally resuspended in 25 μl of elution solution. All procedures were performed at ambient temperature RNase contamination was avoided by the wearing of gloves, observation of sterile technique and treatment of solutions and non-disposable glass and plasticware with diethyl pyrocarbonate (DEPC). The RNA was resuspended in DEPC-treated sterile water.

Example 2

Synthesis of cDNA

cDNA was synthesised from the purified genomic RNA using Great Lengths™ cDNA amplification reverse transcriptase reagents (Clontech Laboratories Inc.) following the manufacturer's instructions. The RNA was primed with both oligo(dT) and random hexamers to maximise synthesis.

The Great Lengths cDNA synthesis protocol is based on a modified Gubler and Hoffman (1983) protocol for generating complementary DNA libraries and essentially consists or first-strand synthesis, second strand synthesis, adaptor ligation, and size fractionaction.

First strand synthesis: lock-docking primers anneal to the begining of the poly-A tail of the RNA due to the presence of A, C of a residue at the 3′-end of the primer. This increases the efficiency of cDNA synthesis or eliminating unnecessary reverse transcription of long stretches of poly-A. In addition, the reverse transcriptase used is MMLV (RNase H′) which gives consistently better yields than do wild-type MMLV or AMV reverse transcriptase.

Second strand synthesis: the ratio of DNA polymerase I for RNase H has been optimised to increase the efficiency of the second strand synthesis and to minimize priming by hair pin loop formation. Following second-strand synthesis, the ds cDNA is treated with T4 DNA polymerase to create blunt ends.

Adaptor ligation: the cDNA is ligated to a specially designed adaptor that has a pre-existing EcoRI “sticky end”. The use of this adaptor, instead of a linker, eliminates the need to methylate and the EcoRI—digest the cDNA, and thus leaves internal EcoRI, sites intact. The adaptor is 5′-phosphorylated at the blunt end to allow efficient ligation to the blunt-ended cDNA.

Size fractionation: the ds cDNA is phosphorylated at the EcoRI sites and size-fractionated to remove unligated adaptors and unincorporated nucleotides. The resulting cDNA is ready for cloning into a suitable EcoRI-digested vector.

Example 3

Molecular Cloning of cDNA

The size fractionated fragment was ligated with EcoRI-digested pZErO™ −1 plasmid vector. DNA (Invitrogen Corporation, San Diego, U.S.). The ligation mix was used to transform competent TOP10F′cells and these were plated onto L-Agar containing zeocin following the manufacturer's instructions (Zero Background™ cloning kit—Invitroqen). Several of the resulting zeocin resistant colonies were amplified in L-Broth containing zeocin and the plasmid DNA was purified by alkaline lysis (Maniatis et al., 1982).

The plasmid DNA was digested to completion with the endonuclease EcoRI and the resulting DNA fragments were separated by electrophoresis through an 1.0% agarose gel (Maniatis et al., 1982), in order to check that a fragment in the predicted size fractionated size range had been cloned. A clone identified as pPoEV was used in further experimentation.

Example 4

DNA Sequence Analysis.

pPoEV plasmid DNA was purified according to common techniques (Sambrook et al, 1989) and sequenced using an ABI automated sequencer. Overlapping sequencing primers from both strands of the molecular clone were used to determine the nucleotide sequence.

The first sequence obtained is shown in FIG. 1. This sequence was identified as encoding two ORFs of 924 (nucleotides 23-2793) and 218 (nucleotides 2642-3297) amino acids, relating to the pol and env genes respectevely. This sequence was revised and updated to the second sequence as shown in FIG. 2. This second sequence was identified as encoding three ORFs of 516 (nucleotides 576-2126), 1186 (nucleotides 2143-5733) and 656 (nucleotides 5606-7576) amino acids, encoding the PoEV gag, pol and env genes respectively. This second sequence has since been revised and updated to the sequence shown in FIG. 3. This third sequence was identified as encoding three ORFs of 524 (nucleotides 588-2162), 1194 (nucleotides 2153-5747) and 656 (nucleotides 5620-7590) amino acids, encoding the PoEV gag, pol and env genes respectively.

The differences in the disclosed sequences is reflected by improvements in carrying out and analysing the sequence obtained. However, there is 100% identity at the nucleic acid level, between positions 21-2681 so the first sequence and positions 2972-5653 of the third sequence. Overall there is a 70.5% identity in the entire 3310 bp of the first sequence with a corresponding portion of the third sequence.

There are only 3 base changes between the second sequence and the third sequence. These are as follows:

base no. (from FIG. 2) change 2121 insertion of a “G” 2157 insertion of a “G” 5902 “R” to an “A” 7700 “M” to an “A”

The changes at base nos. 5902 and 7700 do not effect the corresponding amino acid sequence. However, the changes at positions 2121 and 2157 alter the amino acid sequence at the end of GAG and the beginning of POL. For GAG the final amino acid “S” have now been replaced by “VLALEEDKD” (SEQ ID NO: 15). The total product size is now 524 amino acids. For POL, the first five amino acids “RLGET” (SEQ ID NO: 16) have been deleted and replaced by “GRR”. The total product size is now 1194 amino acids.

Similarities were observed between pPoEV and the majority of retroviruses determined by using alogrithims from DNASTAR Inc. Lasergene software (DNASTAR). The similarities were closest with gibbon ape leukaemia virus (GaLV) in the polymerase (pol) regions of the pro-virus at 68.5%, in the virus core (gaq) region, 59.2% and in the envelope (env) region, 39.3% The nucleotide sequence and major ORFs of the pPoEV insert are shown in FIG. 3. The largest ORF (nucleotides 2163-5747) encodes the polymerase polypeptide and the smaller ORFs (nucleotides 588-2162 and 5620-7590) encode the core and envelope polypeptides respectively.

Example 5

Purification of Cellular DNA from Cultured Cells, Tissues and Blood.

Cultured Cells

Cells were maintained in culture and approximately 5×10⁷ cells were harvested for DNA preparation. The cells were pelleted by centrifugation resuspended in phosphate-buffered saline, re-centrifuged at 1000 g for 2 minutes and the supernatant was discarded.

Porcine Tissues

Porcine tissue samples were frozen in liquid nitrogen and powdered by grinding in a mortar or between metal foil. The samples were resuspended in 5 ml of extraction buffer consisting of 0.025M EDTA (pH 8.0), 0.01 MTris.Cl pH 8.0, 0.5% SdS 20 μg/ml RNAse and 100 μg/ml proteinase K (Maniatis at., 1982).

Porcine Blood

A buffy coat was prepared from the blood samples, 20 ml samples were centrifuged at 1000 g for 15 minute. The buffy coat was resuspended in buffer and the samples centrifuged at 1000 g for 15 minutes. The process was repeated one further time. The sample was mixed with 5 ml (3× volume) of extraction buffer (Maniatis et al., 1982).

Purification

The samples (i.e. cultured cells, porcine tissue or porcine blood cells) in proteinase K-extraction buffer containing 20 g/ml RNAse and 100 μg/ml proteinase K were digested for approximately 24 hours at 37° C. The deproteinised DNA was extracted twice with phenol and twice with phenol chloroform and finally precipitated by ethanol in the presence of ammonium acetate. The DNA was recovered by centrifugation at 3000 g for 30 minutes and the supernatant discarded (Maniatis et al., 1982). The pellet was washed in 70% ethanol and allowed to air dry for approximately 1 hour. The DNA was allowed to re-dissolve in Tris EDTA (TE) buffer and the purity and concentration of the DNA was assessed by spectrophotometry (Maniatis et al., 1982).

Example 6

Southern Blot Analysis of Porcine Tissue and Cells

In order to demonstrate that the molecularly cloned DNA comprising the insert from PoEV was derived from the PK-15 cell line (American Type Culture Collection CCL33), the DNA was hybridised against cellular DNAs and its ability to detect proviral DNA was examined.

DNA purified from pPoEV was radioactively labelled and used to probe a Southern blot of endonuclease digested DNAs derived from PK-15 cells

The DNAs probed were as follows:

a) Copy number controls of pPoEV DNA linearized by digestion with EcoRI. One copy per haploid cell genome was estimated to be 6.84 pg. The control was present at an estimated copy number of 1, 5 and 10 copies.

b) pK-15 DNA.

c) Negative control HeLa (American Type Culture Collection CCL2) DNA derived from a human adenocarcinoma cell line harbouring human papillomavirus type 18 DNA.

d) Negative control SP20 (European Collection of Animal Cell Cultures 85072401) DNA derived from a murine myeloma cell line harbouring a xenotropic MuLV retrovirus.

A hybridisation signal was observed in only the PK-15 porcine DNA. No signal was detected in either the negative human or murine DNAs. The PK-15 DNA contained more than 10 copies per cell with an estimated copy number of 20. The sizes of the three major EcoRI—endonuclease digested DNA fragments were approximately 3.8 kb, 1.8 kb and 0.6 kb. The sizes of relevant fragments detected in the recombinant pPoEV were comparable.

There are, as expected, a number of fragments common to the genomic DNA of PK-15 and pPoEV DNA and there is agreement between the patterns observed in both DNAs digested with XhoI, BamHI and HindIII. However, there are additional fragments obtained on digestion of pPoEV DNA by a number of endonucleases.

pPoEV sequences were also detected in swine testes (American Type Culture Collection CRL 1746) and primary porcine kidney cells (Central Veterinary Laboratory batch C04495) but not in hamster CHOK1 (American Type Culture Collection CCL61) or murine NSO myeloma cells (European Collection of Animal Cell Cultures 85110503).

In order to demonstrate that the molecularly cloned DNA comprising the insert from pPoEV could detect sequences in porcine cells and tissues in addition to PK-15 the pPoEV DNA was hybridised against cellular DNA from tissues derived from pigs and its ability to detect proviral DNA was examined (Maniatis et al., 1982).

The DNA purified from pPoEV was radioactively labelled and used to probe a Southern blot of endonuclease digested DNAs derived from pig organs including liver, kidney, heart and blood.

The DNAs probed were as follows:

a) Copy number controls of pPoEV DNA linearized by digestion with EcoRI. One copy per haploid cell genome was estimated to be 6.34 g. The control was present at an estimated copy number of 5,10, 20 and 50 copies.

b) DNA purified from the porcine tissues digested with EcoRI.

A hybridisation signal was observed in all the porcine DNAs.

The DNAs contained less than 5 copies per cell. There were approximately eight distinct bands in each DNA. The sizes of the three major endonuclease digested DNA fragments were approximately 3.8 kb, 1.8 kb and 0.6 kb.

Example 7

Polymerase Chain Reaction (PCR) Amplifications

Oligonucleotides were selected from the PoEV genome.

The upstream primer was 5′-GGA AGT GGA CTT CAC TGA G-3′ (SEQ ID NO: 7).

The downstream primer was 5′-CTT TCC ACC CCG AAT CGG-3′ (SEQ ID NO: 8).

The PCR was performed as described by Saiki et al (1987). One 1 μl of 100 ng/μl template DNA was added to a 49 μl reaction mixture containing 200 μM of dATP, dCTP, dGTP, dTTP, 30 pmol of both primers from the pair described above, 1 unit of DNA polymerase and 5 μl of reaction buffer. The reaction buffer contained 200 mM Tris-HCl pH 8.4, 500 mM potassium chloride and 15 mM magnesium chloride, ultrapure water. The solution was overlaid with two drops of mineral oil to prevent evaporation. Thirty five cycles of amplification were performed using a Perkin Elmer Cetus thermal cycler. Each cycle consisted of 1 minute, at 95° C. to denature the DNA, 1 minute, at 53° C. to anneal the primers to the template and 1 minute at 72° C. for primer extension. After the last cycle a further incubation for 10 minutes, at 72° C. was performed to allow extension or any partially completed product. On completion of the amplification, 10μl of the reaction mixture was electrophoresed through a 5 per cent acrylamide gel. The DNA was visualised by staining with ethidium bromide and exposure to ultraviolet light (320 nm).

The PCR reaction amplified a sequence of approximately 787 bp from pPoEV and from porcine cells as expected indicating that the assay detected the PoEV proviral DNA. There was no specific amplification of the expected sequence in cells of non-porcine origin and therefore, the PCR reaction and recombinant clone can be used as a specific and sensitive diagnostic tool for detection of PoEV.

Two further oligonucleotides were designed against the 3′ end of the pol gene and 5′ end of the gag gene respectively.

The 3′ pol oligonucleotide was 5′-GAT GGC TCT CCT GCC CTT TG-3′ (SEQ ID NO: 11).

The 5′ gag oligonucleotide was 5′-CGA TGG AGG CGA AGC TTA AGG-3′ (SEQ ID NO: 12).

The above oligonucleotide were also used in PCR reactions according to the conditions described above, with the exceptions that the annealing temperature was 58° and 30 cycles of replication were carried out The PCR reaction amplified a sequence of approximately 468 bp from pPoEV and from porine cells.

Example 8

Production of PoEV Polypeptide in Escherichia coli.

The open reading frame (ORF) encoding the pol peptide was isolated from the pPoEV clone and molecularly cloned into the plasmid pGEX-4T-1 (Pharmacia Ltd.) for expression.

Two ml cultures of E. coli transformed with various expression constructs were grown with shaking at 37° C. to late log phase (O.D._(600nm) of 0.6) and induced by the addition of IPTG to 0.1 mM. Induced cultures were then incubated for a further 2 hours after which the bacteria were collected by centrifugation. The bacterial pellet was lysed by boiling in SDS-PAGE sample buffer and the protein profile of the induced bacteria was analysed on a 12% acrylamide gel (Laemmli, 1970) followed by staining with coomassie brilliant blue dye.

Example 9

Isolation and Partial Sequencing of Raji Clone

The aim of the study was to determine whether the human cell line “Raji” was susceptible to infection with the PoEV present in porcine kidney cells (PK15). In order to test the capacity of the virus for xenotropism, PK15 cells were co-cultured with the B lymphoblastoid (Raji) cell line over 20 passages.

The culture system utilised direct culture and transwells, which separated the human and porcine cells, but permitted viruses to pass through the separating membrane. After every fifth passage, supernatants from the human cell lines are tested for the presence of retrovirus by reverse transcriptase assay.

Cell Cultures

Porcine kidney (PK15) cells (ATCC CCL 33) were used as the source of PoEV. The human cells used for co-cultivation with PK15 cells were the lymphoblast-like Burkitts lymphoma Raji (ATCC CCL 86) cell line. This cell line does not harbour endogenous retroviruses and lacks reverse transcriptase activity when tested by the present inventors.

Co-cultivation

Raji cells were co-cultivated directly with PK15 cells in duplicate 80 cm² flasks and exposed to the PK15 cells throughout the 20 passage culture period. The cells were passaged twice per week and PK15 cells added as necessary from a stock culture. At every fifth passage a sample of Raji cells was removed from the co-culture, washed and cultured for 3-4 days. Supernatant was then harvested and tested for presence of retrovirus by reverse transcriptase (RT) assay.

Results

The presence of reverse transcriptase activity with a preference for the Mn²⁻ cation in the supernatant from detector cell cultures is suggestive of infection by porcine retrovirus. Reverse transcriptase activity with preference for the Mn²⁻ template was not detected in the duplicate co-cultivated test cultures at passage 5 but was detected at passages 10, 15 and 20. No significant RT activity was detected in the negative control cultures. RT activity with preference for the Mn²⁻ template was detected in positive control cultures at passage 5 and 20. An infected raji culture was diluted to single cells, and then a selection of cells cultured separately such that each culture originated from one cell. Each culture was tested by reverse-transcriptase assay. Genomic DNA was made from an RT-positive clone as described in example 5-purification. The PoEV ENV region was amplified by PCR as described below and the product molecularly cloned into pMOS blue T-vector (Amersham) This molecular clone was then sequenced (FIG. 4).

PCR

Oligonucleotides were selected from the PoEV genome.

The upstream primer was 5′-GAT GGC TCT CCT GCC CTT TG-3′ (SEQ ID NO: 13) 5′ base position: 5240.

The downstream primer was 5′-CCA CAG TCG TAC ACC ACG-3′ (SEQ ID NO: 14) 5′ base position: 8144.

Expected product size: 2904 bp.

Approx. 1 μg of genomic raji clone DNA was added to a 50 μl reaction mixture containing 200 μM of dATP, dCTP, dGTP, dTTP, 30 pM each primer detailed above, 1 u Taq DNA polymerase and 5 μl reaction buffer. The reaction buffer contained 200 mM Tris.Cl pH 8.4, 500 mM potassium chloride, 15 mM magnesium chloride and ultrapure water. The solution was overlaid with two drops of mineral oil to prevent evaporation. Thirty cycles of amplification was performed followed by an elongated extension reaction of 60 min. at 72° C.

The cycles consisted of:

95° C. 1 min

56° C. 1 min.

72° C. 2 min.

The PCR product was visualised as described in example 7. Product size: −3 Kb.

Cloning

The PCR product was molecularly cloned into pMOS-Blue T-vector as directed by the manufacturer (pMOS-Blue T-vector kit—Amersham).

20 transformed colonies (clones) were picked and added to 5 mls L-broth containing 50 μg/ml ampicillin. The cultures were grown shaking at 37° C. overnight. Plasmid DNA was isolated from each clone using the perfect prep plesmid isolation kit as directed by the manufacturer (5 Prime—3 Prime Inc. Boulder, Co., USA).

Plasmid DNA was digested to completion with the endonucleases EcoRI and HindIII and the products visualised on an ethidium bromide-stained 1% agarose gel. A clone (raji env clone) showing the same banding pattern as that predicted for ‘pK15 cell line derived PoEV’, was selected for sequencing.

Sequencing

Raji env clone plasmid DNA prepared above was sequenced using an ABI automated sequencer, and the commercially available T7 sequencing primer.

The entire env gene region of the “Raji” was sequenced (see FIG. 4) and discovered to have substantial sequence identity at both the nucleic acid and amino acid levels (98.9% and 96.3% respectively) with the PoEV sequence from PK-15.

Example 10

Phylogenetic Analysis

Phylogenetic analysis was performed using the PHYLIP package. Sequence distances were calculated using the PROTDIST program (Dayhoff matrix) and a neighbour-joining unrooted phylogenetic tree reconstructed using the NEIGHBOUR program.

Bootstrapping was performed using 200 replicates of the pol alignment, created using the SEQBOOT program and a consensus tree was obtained using the CONSENSE program (see FIG. 5). The bootstrap percentages are indicated at the branch fork, with missing values equal to 100%. The data indicate that PoEV is closely related to but distinct from the type-C oncovirus typified by gibbon, murine and feline leukaemia viruses.

A phylogenetic tree was constructed from the pol alignment using the maximum likelihood algorithm (Dayhoff matrix). This tree differed from the pol NJ tree only in the placement of the BaEV lineage in relation to other mammalian type C viruses and corresponded to a low bootstrap for the BaEV fork observed in the NJ tree.

Example 11

Analysis of the LTR and Adjacent Region

The long terminal repeat (LTR) is a reiterated sequence at each end of the provirus that contains the enchancer and promoter governing transcription of the provirus as well as sequences required for reverse transcription of the RNA genome and integration of the proviral DNA. Three recognised domains of the LTR are identifiable, U3, R and U5 with the LTR being delineated by inverse repeats AATGAAAGG and CCTTTCATT a the 5′ and 3′ ends of U3 and U5 respectively.

PoEV Genome Sequence LTR Domain in accordance with FIG. 3 Length bp U3 7638-8106 469 R* 8107-8188, 1-61  82 U5 62-143  82 *The position of the R is defined here by similarity to the 3′ end of the MuLV LTR and is compatible with the observed location of a cap site approximately 24 bp downstream of the TATA box.

The U3 region contains multiple potential transcription sites as shown in FIG. 6. Most of the U3 region shows little or no homology to other mammalian type-C retroviruses which show conserved sites or repeat elements. However, there is homology to other mammalian type-C viruses towards the 3′end of the U3 & region and into R and U5. Amongst the potential transcription factor sites are those for the following:

LyF-1 is a transcriptional regulator that interacts with a novel class of promoters for lymphocyte-specific-genes (Lo et al 1991).

E47 is the prototype member of a new family of tissue specific enhancer proteins that have been shown to bind to the enhancer of murine leukaemia virus.

ETS-1 is a transcription factor primarily expressed in the haematopoiatic lineage.

The LTR contains direct repeats at 80006-8062 and 8045-8101 which together contain three potential CCAATT boxes. A potential TATA box is located at position 8129-8144.

The R region contains a PADS (Poly A downstream element) and consensus polyadenylation signal (AATAAA).

The primer binding site (PBS) of PoEV is glycine(2) tRNA which has not reported for any exogenous retrovirus.

References

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Derynck R, Singh A and Goeddel D V. (1983). Expression of the human interfron-γ in yeast. Nucleic Acids Res., 11, 1319-1837.

DNASTAR. (1994). Lasergene Biocomputing Software for Windows, User's Guide.

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Laemmli UK. (1970). Cleavage of structural proteins during the assembly of the head of bacteriophage T4N. Nature, 227, 680-685.

Liaber M M, Sherr C J. Benveniste R E and Torado G J. (1975). Biologic and immunologic properties of porcine type C viruses. Virology 66, 616-619.

Lo K, LAndau N R, Smale S T. Mol. Cell. Biol. 11:5229-5243 (1991)

Maniatis T, Fritsch E F and Sambrook J. (1982) Molecular Cloning: A Laboratory Manual, Cold spring Harbour Laboratory, Cold Spring Harbour, N.Y.

Saiki R K, Galfand D H, Stoffel S, Scharf S J, Higuchi R, Horn G T Mullis K B and Erlich H A. (1987). Prime-directed enzymatic amplification of DNA with a thermostable DNA polymerase. Science 239, 437-491.

Sambrook J Fritsch E F, and Maniatis T. (1989). Molecular Cloning a Laboratory Manual, 2nd ed. Cold Spring Harbour Laboratory, Cold Spring Harbour N.Y.

Smith G E, Summers M D and Fraser M J. (1983). Production of human beta interferon in insect cells infected with a baculovirus vector. Mol. Cell. Biol., 3, 2156-2165.

Stranstrom H, Verjalainen P, Meoning V Hunsmann G, Schwarz H. and Schafer W. (1974). C-type particles produced by a permanent cell line from a leukemic pig. 1 Origin and properties of host cells and some evidence for the occurence of C-Type like particles Virology 57, 175-178.

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SEQUENCE LISTING <160> NUMBER OF SEQ ID NOS: 17 <210> SEQ ID NO 1 <211> LENGTH: 3320 <212> TYPE: DNA <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 1 gaattcgcgg ccgcgtcgac agatgccttc ttctgcctga gattacaccc cactagccaa 60 ccactttttg ccttcgaatg gagagatcca ggtacgggaa gaaccgggca gctcacctgg 120 acccgactgc cccaagggtt caagaactcc ccgaccatct ttgacgaagc cctacacagg 180 gacctggcca acttcaggat ccaacaccct caggtgaccc tcctccagta cgtggatgac 240 ctgcttctgg cgggagccac caaacaggac tgcttagaag gtacgaaggc actactgctg 300 gaattgtctg acctaggcta cagagcctct gctaagaagg cccagatttg caggagagag 360 gtaacatact tggggtacag tttgcggggc gggcagcgat ggctgacgga ggcacggaag 420 aaaactgtag tccagatacc ggccccaacc acagccaaac aagtgagaga gtttttgggg 480 acagctggat tttgcagact gtggatcccg gggtttgcga ccttagcagc cccactctac 540 ccgctaacca aagaaaaagg gggattctcc tgggctcctg agcaccagaa ggcatttgat 600 gctatcaaaa aggccctgct gagcgcacct gctctggccc tccctgacgt aactaaaccc 660 tttacccttt atgtggatga gcgtaaggga gtagcccgag gagttttaac ccaaacccta 720 ggaccatgga ggagacctgt tgcctacctg tcaaagaagc ttgatcctgt agccagtggt 780 tggcccgtat gtctgaaggc tatcgcagct gtggccatac tggtcaagga cgctgacaaa 840 ttgactttgg gacagaatat aactgtaata gccccccatg cattggagaa catcgttcgg 900 cagcccccag accgatggat gaccaacgcc cgcatgaccc actatcaaag cctgcttctc 960 acagagaggg tcactttcgc tccaccagcc gctctcaacc ctgccactct tctgcctgaa 1020 gagactgatg aaccagtgac tcatgattgc catcaactat tgattgagga gactggggtc 1080 cgcaaggacc ttacagacat accgctgact ggagaagtgc taacctggtt cactgacgga 1140 agcagctatg tggtggaagg taagaggatg gctggggcgg cagtggtgga cgggacccgc 1200 acgatctggg ccagcagcct gccggaagga acttcagcgc aaaaggctga gctcatggcc 1260 ctcacgcaag ctttgcggct ggccgaaggg aaatccataa acatttatac ggacagcagg 1320 tatgcctttg cgactgcaca cgtacacggg gccatctata aacaaagggg gttgcttacc 1380 tcagcaggga gggaaataaa gaacaaagag gaaattctaa gcctattaga agccttacat 1440 ttgccaaaaa ggctagctat tatacactgt cctggacatc agaaagccaa agatctcata 1500 tctagaggga accagatggc tgaccgggtt gccaagcagg cagcccaggc tgttaacctt 1560 ctgcctataa tagaaacgcc caaagcccca gaacccagac gacagtacac cctagaagac 1620 tggcaagaga taaaaaagat agaccagttc tctgagactc cggaggggac ctgctatacc 1680 tcatatggga aggaaatcct gccccacaaa gaagggttag aatatgtcca acagatacat 1740 cgtctaaccc acctaggaac taaacacctg cagcagttgg tcagaacatc cccttatcat 1800 gttctgaggc taccaggagt ggctgactcg gtggtcaaac attgtgtgcc ctgccagctg 1860 gttaatgcta atccttccag aatacctcca ggaaagagac taaggggaag ccacccaggc 1920 gctcactggg aagtggactt cactgaggta aagccggcta aatacggaaa caaatatcta 1980 ttggtttttg tagacacctt ttcaggatgg gtagaggctt atcctactaa gaaagagact 2040 tcaaccgtgg tggctaagaa aatactggag gaaatttttc caagatttgg aatacctaag 2100 gtaatagggt cagacaatgg tccagctttc gttgcccagg taagtcaggg actggccaag 2160 atattgggga ttgattggaa actgcattgt gcatacagac cccaaagctc aggacaggta 2220 gagaggatga atagaaccat taaagagacc cttaccaaat tgaccacaga gactggcatt 2280 aatgattgga tggctctcct gccctttgtg ctttttaggg tgaggaacac ccctggacag 2340 tttgggctga ccccctatga attgctctac gggggacccc ccccgttggc agaaattgcc 2400 tttgcacata gtgctgatgt gctgctttcc cagcctttgt tctctaggct caaggcgctc 2460 gagtgggtga ggcagcgagc gtggaagcag ctccgggagg cctactcagg aggagacttg 2520 caagttccac atcgcttcca agttggagat tcagtctatg ttagacgcca ccgtgcagga 2580 aacctcgaga ctcggtggaa gggaccttat ctcgtacttt tgaccacacc aacggctgtg 2640 aaagtcgaag gaatccccac ctggatccat gcatcccacg ttaagccggc gccacctccc 2700 gattcggggt ggaaagccga aaagactgaa aatcccctta agcttcgcct ccatcgcgtg 2760 gttccttact ctgtcaataa ctcctcaagt taatggtaaa cgccttgtgg acagcccgaa 2820 ctcccataaa cccttatctc tcacctggtt acttactgac tccggtacag gtattaatat 2880 taacagcact caaggggagg ctcccttggg gacctggtgg cctgaattat atgtctgcct 2940 tcgatcagta atccctggtc tcaatgacca ggccacaccc cccgatgtac tccgtgctta 3000 cgggttttac gtttgcccag gacccccaaa taatgaagaa tattgtggaa atcctcagga 3060 tttcctttgc aagcaatgga gctgcataac ttctaatgat gggaattgga aatggccagt 3120 ctctcagcaa gacagagtaa gttactcttt tgttaacaat cctaccagtt ataatcaatt 3180 taattatggc catgggagat ggaaagattg gcaacagcgg gtacaaaaag atgtacgaaa 3240 taagcaaata agctgtcatt cgttagacct agattactta aaaataagtt tcactaaaaa 3300 aaaaaaaaaa aaaaaaaaaa 3320 <210> SEQ ID NO 2 <211> LENGTH: 8196 <212> TYPE: DNA <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 2 tgtgggcccc agcgcgcttg gaataaaaat cctcttgctg tttgcatcaa gaccgcttct 60 cgtgagtgat ttggggtgtc gcctcttccg akcccggacg agggggattg ttcttttact 120 ggcctttcat ttggtgcgtt ggccgggaaa tcctgcgacc accccttaca cccgagaacc 180 gacttggagg taaagggatc ccctttggaa cgtgtgtgtg tgtcggccgg cgtctctgtt 240 ctgagtgtct gttttcggtg atgcgcgctt tcggtttgca gctgtcctct cagaccgtaa 300 ggactggagg actgtgatca gcagacgtgc taggaggatc acaggctgcc accctggggg 360 acgccccggg aggtggggag agccagggac gcctggtggt ctcctactgt cggtcagagg 420 accgagttct gttgttgaag cgaaagcttc cccctccgcg gccgtccgac tcttttgcct 480 gcttgtggaa gacgcggacg ggtcgcgtgt gtctggatct gttggtttct gtctcgtgtg 540 tctttgtctt gtgcgtcctt gtctacagtt ttaatatggg acagacagtg actacccccc 600 ttagtttgac tctcgaccat tggactgaag ttagatccag ggctcataat ttgtcagttc 660 aggttaagaa gggaccttgg cagactttct gtgcctctga atggccaaca ttcgatgttg 720 gatggccatc agaggggacc tttaattctg aaattatcct ggctgttaag gcaatcattt 780 ttcagactgg acccggctct catcctgatc aggagcccta tatccttacg tggcaagatt 840 tggcagaaga tcctccgcca tgggttaaac catggctaaa taaaccaaga aagccaggtc 900 cccgaatcct ggctcttgga gagaaaaaca aacactcggc cgaaaaagtc gagccctctt 960 cctcgtatct accccgagat cgaggagccg ccgacttggc cggaacccca acctgttccc 1020 ccaccccctt atccagcaca gggtgctgtg aggggacctc tgcccctcct ggagctccgg 1080 tggtggaggg acctgctgcc gggactcgga gccggagagg cgccaccccg gagcggacag 1140 acgagatcgc gatattaccg ctgcgcacct atggccctcc catgccaggg ggccaattgc 1200 agcccctcca gtattggccc ttttcttctg cagatctcta taattggaaa actaaccatc 1260 cccctttctc ggaggatccc caacgcctca cggggttggt ggagtccctt atgttctctc 1320 accagcctac ttgggatgat tgtcaacagc tgctgcagac actcttcaca accgaggagc 1380 gagagagaat tctgttagag gctagaaaaa atgttcctgg ggccgacggg cgacccacgc 1440 agttgcaaaa tgagattgac atgggatttc ccttgactcg ccccggttgg gactacaaca 1500 cggctgaagg tagggagagc ttgaaaatct atcgccaggc tctggtggcg ggtctccggg 1560 gcgcctcaag acggcccact aatttggcta aggtaagaga ggtgatgcag ggaccgaacg 1620 aacctccctc ggtatttctt gagaggctca tggaagcctt caggcggttc accccttttg 1680 atcctacctc agaggcccag aaagcctcag tggccctggc cttcattggg cagtcggctc 1740 tggatatcag gaagaaactt cagagactgg aagggttaca ggaggctgag ttacgtgatc 1800 tagtgagaga ggcagagaag gtgtattaca gaagggagac agaagaggag aaggaacaga 1860 gaaaagaaaa ggagagagaa gaaagggagg aaagacgtga tagacggcaa gagaagaatt 1920 tgactaagat cttggccgca gtggttgaag ggaagagcag cagggagaga gagagagatt 1980 ttaggaaaat taggtcaggc cctagacagt cagggaacct gggcaatagg accccactcg 2040 acaaggacca gtgtgcgtat tgtaaagaaa aaggacactg ggcaaggaac tgccccaaga 2100 agggaaacaa aggaccgaag tcctagctct agaagaagat aaagattagg ggagacgggt 2160 tcggaccccc tccccgagcc cagggtaact ttgaaggtgg aggggcaacc agttgagttc 2220 ctggttgata ccggagcgga gcattcagtg ctgctacaac cattaggaaa actaaaagaa 2280 aaaaaatcct gggtgatggg tgccacaggg caacggcagt atccatggac tacccgaaga 2340 accgttgact tgggagtggg acgggtaacc cactcgtttc tggtcatccc tgagtgccca 2400 gtaccccttc taggtagaga cttactgacc aagatgggag ctcaaatttc ttttgaacaa 2460 ggaagaccag aagtgtctgt gaataacaaa cccatcactg tgttgaccct ccaattagat 2520 gatgaatatc gactatattc tccccaagta aagcctgatc aagatataca gtcctggttg 2580 gagcagtttc cccaagcctg ggcagaaacc gcagggatgg gtttggcaaa gcaagttccc 2640 ccacaggtta ttcaactgaa ggccagtgct acaccagtat cagtcagaca gtaccccttg 2700 agtagagagg ctcgagaagg aatttggccg catgttcaaa gattaatcca acagggcatc 2760 ctagttcctg tccaatcccc ttggaatact cccctgctac cggttaggaa gcctgggacc 2820 aatgattatc gaccagtaca ggacttgaga gaggtcaata aaagggtgca ggacatacac 2880 ccaacggtcc cgaaccctta taacctcttg agcgccctcc cgcctgaacg gaactggtac 2940 acagtattgg acttaaaaga tgccttcttc tgcctgagat tacaccccac tagccaacca 3000 ctttttgcct tcgaatggag agatccaggt acgggaagaa ccgggcagct cacctggacc 3060 cgactgcccc aagggttcaa gaactccccg accatctttg acgaagccct acacagggac 3120 ctggccaact tcaggatcca acaccctcag gtgaccctcc tccagtacgt ggatgacctg 3180 cttctggcgg gagccaccaa acaggactgc ttagaaggta cgaaggcact actgctggaa 3240 ttgtctgacc taggctacag agcctctgct aagaaggccc agatttgcag gagagaggta 3300 acatacttgg ggtacagttt gcggggcggg cagcgatggc tgacggaggc acggaagaaa 3360 actgtagtcc agataccggc cccaaccaca gccaaacaag tgagagagtt tttggggaca 3420 gctggatttt gcagactgtg gatcccgggg tttgcgacct tagcagcccc actctacccg 3480 ctaaccaaag aaaaaggggg attctcctgg gctcctgagc accagaaggc atttgatgct 3540 atcaaaaagg ccctgctgag cgcacctgct ctggccctcc ctgacgtaac taaacccttt 3600 accctttatg tggatgagcg taagggagta gcccgaggag ttttaaccca aaccctagga 3660 ccatggagga gacctgttgc ctacctgtca aagaagcttg atcctgtagc cagtggttgg 3720 cccgtatgtc tgaaggctat cgcagctgtg gccatactgg tcaaggacgc tgacaaattg 3780 actttgggac agaatataac tgtaatagcc ccccatgcat tggagaacat cgttcggcag 3840 cccccagacc gatggatgac caacgcccgc atgacccact atcaaagcct gcttctcaca 3900 gagagggtca ctttcgctcc accagccgct ctcaaccctg ccactcttct gcctgaagag 3960 actgatgaac cagtgactca tgattgccat caactattga ttgaggagac tggggtccgc 4020 aaggacctta cagacatacc gctgactgga gaagtgctaa cctggttcac tgacggaagc 4080 agctatgtgg tggaaggtaa gaggatggct ggggcggcag tggtggacgg gacccgcacg 4140 atctgggcca gcagcctgcc ggaaggaact tcagcgcaaa aggctgagct catggccctc 4200 acgcaagctt tgcggctggc cgaagggaaa tccataaaca tttatacgga cagcaggtat 4260 gcctttgcga ctgcacacgt acacggggcc atctataaac aaagggggtt gcttacctca 4320 gcagggaggg aaataaagaa caaagaggaa attctaagcc tattagaagc cttacatttg 4380 ccaaaaaggc tagctattat acactgtcct ggacatcaga aagccaaaga tctcatatct 4440 agagggaacc agatggctga ccgggttgcc aagcaggcag cccaggctgt taaccttctg 4500 cctataatag aaacgcccaa agccccagaa cccagacgac agtacaccct agaagactgg 4560 caagagataa aaaagataga ccagttctct gagactccgg aggggacctg ctatacctca 4620 tatgggaagg aaatcctgcc ccacaaagaa gggttagaat atgtccaaca gatacatcgt 4680 ctaacccacc taggaactaa acacctgcag cagttggtca gaacatcccc ttatcatgtt 4740 ctgaggctac caggagtggc tgactcggtg gtcaaacatt gtgtgccctg ccagctggtt 4800 aatgctaatc cttccagaat acctccagga aagagactaa ggggaagcca cccaggcgct 4860 cactgggaag tggacttcac tgaggtaaag ccggctaaat acggaaacaa atatctattg 4920 gtttttgtag acaccttttc aggatgggta gaggcttatc ctactaagaa agagacttca 4980 accgtggtgg ctaagaaaat actggaggaa atttttccaa gatttggaat acctaaggta 5040 atagggtcag acaatggtcc agctttcgtt gcccaggtaa gtcagggact ggccaagata 5100 ttggggattg attggaaact gcattgtgca tacagacccc aaagctcagg acaggtagag 5160 aggatgaata gaaccattaa agagaccctt accaaattga ccacagagac tggcattaat 5220 gattggatgg ctctcctgcc ctttgtgctt tttagggtga ggaacacccc tggacagttt 5280 gggctgaccc cctatgaatt gctctacggg ggaccccccc cgttggcaga aattgccttt 5340 gcacatagtg ctgatgtgct gctttcccag cctttgttct ctaggctcaa ggcgctcgag 5400 tgggtgaggc agcgagcgtg gaagcagctc cgggaggcct actcaggagg agacttgcaa 5460 gttccacatc gcttccaagt tggagattca gtctatgtta gacgccaccg tgcaggaaac 5520 ctcgagactc ggtggaaggg accttatctc gtacttttga ccacaccaac ggctgtgaaa 5580 gtcgaaggaa tccccacctg gatccatgca tcccacgtta agcyggcgcc acctcccgac 5640 tcggggtgga gagccgaaaa gactgagaat ccccttaagc ttcgcctcca tcgcctggtt 5700 ccttactcta acaataactc cccaggccag tagtaaacgc cttatagaca gctcgaaccc 5760 ccatagacct ttatccctta cctggctgat tattgaccct gatacgggtg tcactgtaaa 5820 tagcactcga ggtgttgctc ctagaggcac ctggtggcct gaactgcatt tctgcctccg 5880 attgattaac cccgctgtta aragcacacc tcccaaccta gtccgtagtt atgggttcta 5940 ttgctgccca ggcacagaga aagagaaata ctgtgggggt tctggggaat ccttctgtag 6000 gagatggagc tgcgtcacct ccaacgatgg agactggaaa tggccgatct ctctccagga 6060 ccgggtaaaa ttctcctttg tcaattccgg cccgggcaag tacaaaatga tgaaactata 6120 taaagataag agctgctccc catcagactt agattatcta aagataagtt tcactgaaag 6180 gaaaacagga aaatattcaa aagtggataa atggtatgag ctggggaata gttttttatt 6240 atatggcggg ggagcagggt ccactttaac cattcgcctt aggatagaga cggggacaga 6300 accccctgtg gcaatgggac ccgataaagt actggctgaa caggggcccc cggccctgga 6360 gccaccgcat aacttgccgg tgccccaatt aacctcgctg cggcctgaca taacacagcc 6420 gcctagcaac agtaccactg gattgattcc taccaacacg cctagaaact ccccaggtgt 6480 tcctgttaag acaggacaga gactcttcag tctcatccag ggagctttcc aagccatcaa 6540 ctccaccgac cctgatgcca cttcttcttg ttggctttgt ctatcctcag ggcctcctta 6600 ttatgagggg atggctaaag aaagaaaatt caatgtgacc aaagagcata gaaatcaatg 6660 tacatggggg tcccgaaata agcttaccct cactgaagtt tccgggaagg ggacatgcat 6720 aggaaaagct cccccatccc accaacacct ttgctatagt actgtggttt atgagcaggc 6780 ctcagaaaat cagtatttag tacctggtta taacaggtgg tgggcatgca atactgggtt 6840 aaccccctgt gtttccacct cagtcttcaa ccaatccaaa gatttctgtg tcatggtcca 6900 aatcgtcccc cgagtgtact accatcctga ggaagtggtc cttgatgaat atgactatcg 6960 gtataaccga ccaaaaagag aacccgtatc ccttacccta gctgtaatgc tcggattagg 7020 gacggccgtt ggcgtaggaa cagggacagc tgccctgatc acaggaccac agcagctaga 7080 gaaaggactt ggtgagctac atgcggccat gacagaagat ctccgagcct taaaggagtc 7140 tgttagcaac ctagaagagt ccctgacttc tttgtctgaa gtggttctac agaaccggag 7200 gggattagat ctgctgtttc taagagaagg tgggttatgt gcagccttaa aagaagaatg 7260 ttgcttctat gtagatcact caggagccat cagagactcc atgaacaagc ttagaaaaaa 7320 gttagagagg cgtcgaaggg aaagagaggc tgaccagggg tggtttgaag gatggttcaa 7380 caggtctcct tggatgacca ccctgctttc tgctctgacg gggcccctag tagtcctgct 7440 cctgttactt acagttgggc cttgcttaat taataggttt gttgcctttg ttagagaacg 7500 agtgagtgca gtccagatca tggtacttag gcaacagtac caaggccttc tgagccaagg 7560 agaaactgac ctctagcctt cccagttcta agattagaac tattaacaag acaagaagtg 7620 gggaatgaaa ggatgaaaat gcaacctaac cctcccagaa cccaggaagt taataaaaag 7680 ctctaaatgc ccccgaattm cagaccctgc tggctgccag taaataggta gaaggtcaca 7740 cttcctattg ttccagggcc tgctatcctg gcctaagtaa gataacagga aatgagttga 7800 ctaatcgctt atctggattc tgtaaaactg actggcacca tagaagaatt gattacacat 7860 tgacagccct agtgacctat ctcaactgca atctgtcact ctgcccagga gcccacgcag 7920 atgcggacct ccggagctat tttaaaatga ttggtccacg gagcgcgggc tctcgatatt 7980 ttaaaatgat tggtccatgg agcgcgggct ctcgatattt taaaatgatt ggtttgtgac 8040 gcacaggctt tgttgtgaac cccataaaag ctgtcccgat tccgcactcg gggccgcagt 8100 cctctacccc tgcgtggtgt acgactgtgg gccccagcgc gcttggaata aaaatcctct 8160 tgctgtttgc atcaaaaaaa aaaaaaaaaa aaaaaa 8196 <210> SEQ ID NO 3 <211> LENGTH: 8209 <212> TYPE: DNA <213> ORGANISM: Porcine retrovirus <220> FEATURE: <221> NAME/KEY: CDS <222> LOCATION: (588)..(2159) <221> NAME/KEY: CDS <222> LOCATION: (2163)..(5744) <400> SEQUENCE: 3 gtggtgtacg actgtgggcc ccagcgcgct tggaataaaa atcctcttgc tgtttgcatc 60 aagaccgctt ctcgtgagtg atttggggtg tcgcctcttc cgagcccgga cgagggggat 120 tgttctttta ctggcctttc atttggtgcg ttggccggga aatcctgcga ccacccctta 180 cacccgagaa ccgacttgga ggtaaaggga tcccctttgg aacgtgtgtg tgtgtcggcc 240 ggcgtctctg ttctgagtgt ctgttttcgg tgatgcgcgc tttcggtttg cagctgtcct 300 ctcagaccgt aaggactgga ggactgtgat cagcagacgt gctaggagga tcacaggctg 360 ccaccctggg ggacgccccg ggaggtgggg agagccaggg acgcctggtg gtctcctact 420 gtcggtcaga ggaccgagtt ctgttgttga agcgaaagct tccccctccg cggccgtccg 480 actcttttgc ctgcttgtgg aagacgcgga cgggtcgcgt gtgtctggat ctgttggttt 540 ctgtctcgtg tgtctttgtc ttgtgcgtcc ttgtctacag ttttaat atg gga cag 596 Met Gly Gln 1 aca gtg act acc ccc ctt agt ttg act ctc gac cat tgg act gaa gtt 644 Thr Val Thr Thr Pro Leu Ser Leu Thr Leu Asp His Trp Thr Glu Val 5 10 15 aga tcc agg gct cat aat ttg tca gtt cag gtt aag aag gga cct tgg 692 Arg Ser Arg Ala His Asn Leu Ser Val Gln Val Lys Lys Gly Pro Trp 20 25 30 35 cag act ttc tgt gcc tct gaa tgg cca aca ttc gat gtt gga tgg cca 740 Gln Thr Phe Cys Ala Ser Glu Trp Pro Thr Phe Asp Val Gly Trp Pro 40 45 50 tca gag ggg acc ttt aat tct gaa att atc ctg gct gtt aag gca atc 788 Ser Glu Gly Thr Phe Asn Ser Glu Ile Ile Leu Ala Val Lys Ala Ile 55 60 65 att ttt cag act gga ccc ggc tct cat cct gat cag gag ccc tat atc 836 Ile Phe Gln Thr Gly Pro Gly Ser His Pro Asp Gln Glu Pro Tyr Ile 70 75 80 ctt acg tgg caa gat ttg gca gaa gat cct ccg cca tgg gtt aaa cca 884 Leu Thr Trp Gln Asp Leu Ala Glu Asp Pro Pro Pro Trp Val Lys Pro 85 90 95 tgg cta aat aaa cca aga aag cca ggt ccc cga atc ctg gct ctt gga 932 Trp Leu Asn Lys Pro Arg Lys Pro Gly Pro Arg Ile Leu Ala Leu Gly 100 105 110 115 gag aaa aac aaa cac tcg gcc gaa aaa gtc gag ccc tct tcc tcg tat 980 Glu Lys Asn Lys His Ser Ala Glu Lys Val Glu Pro Ser Ser Ser Tyr 120 125 130 cta ccc cga gat cga gga gcc gcc gac ttg gcc gga acc cca acc tgt 1028 Leu Pro Arg Asp Arg Gly Ala Ala Asp Leu Ala Gly Thr Pro Thr Cys 135 140 145 tcc ccc acc ccc tta tcc agc aca ggg tgc tgt gag ggg acc tct gcc 1076 Ser Pro Thr Pro Leu Ser Ser Thr Gly Cys Cys Glu Gly Thr Ser Ala 150 155 160 cct cct gga gct ccg gtg gtg gag gga cct gct gcc ggg act cgg agc 1124 Pro Pro Gly Ala Pro Val Val Glu Gly Pro Ala Ala Gly Thr Arg Ser 165 170 175 cgg aga ggc gcc acc ccg gag cgg aca gac gag atc gcg ata tta ccg 1172 Arg Arg Gly Ala Thr Pro Glu Arg Thr Asp Glu Ile Ala Ile Leu Pro 180 185 190 195 ctg cgc acc tat ggc cct ccc atg cca ggg ggc caa ttg cag ccc ctc 1220 Leu Arg Thr Tyr Gly Pro Pro Met Pro Gly Gly Gln Leu Gln Pro Leu 200 205 210 cag tat tgg ccc ttt tct tct gca gat ctc tat aat tgg aaa act aac 1268 Gln Tyr Trp Pro Phe Ser Ser Ala Asp Leu Tyr Asn Trp Lys Thr Asn 215 220 225 cat ccc cct ttc tcg gag gat ccc caa cgc ctc acg ggg ttg gtg gag 1316 His Pro Pro Phe Ser Glu Asp Pro Gln Arg Leu Thr Gly Leu Val Glu 230 235 240 tcc ctt atg ttc tct cac cag cct act tgg gat gat tgt caa cag ctg 1364 Ser Leu Met Phe Ser His Gln Pro Thr Trp Asp Asp Cys Gln Gln Leu 245 250 255 ctg cag aca ctc ttc aca acc gag gag cga gag aga att ctg tta gag 1412 Leu Gln Thr Leu Phe Thr Thr Glu Glu Arg Glu Arg Ile Leu Leu Glu 260 265 270 275 gct aga aaa aat gtt cct ggg gcc gac ggg cga ccc acg cag ttg caa 1460 Ala Arg Lys Asn Val Pro Gly Ala Asp Gly Arg Pro Thr Gln Leu Gln 280 285 290 aat gag att gac atg gga ttt ccc ttg act cgc ccc ggt tgg gac tac 1508 Asn Glu Ile Asp Met Gly Phe Pro Leu Thr Arg Pro Gly Trp Asp Tyr 295 300 305 aac acg gct gaa ggt agg gag agc ttg aaa atc tat cgc cag gct ctg 1556 Asn Thr Ala Glu Gly Arg Glu Ser Leu Lys Ile Tyr Arg Gln Ala Leu 310 315 320 gtg gcg ggt ctc cgg ggc gcc tca aga cgg ccc act aat ttg gct aag 1604 Val Ala Gly Leu Arg Gly Ala Ser Arg Arg Pro Thr Asn Leu Ala Lys 325 330 335 gta aga gag gtg atg cag gga ccg aac gaa cct ccc tcg gta ttt ctt 1652 Val Arg Glu Val Met Gln Gly Pro Asn Glu Pro Pro Ser Val Phe Leu 340 345 350 355 gag agg ctc atg gaa gcc ttc agg cgg ttc acc cct ttt gat cct acc 1700 Glu Arg Leu Met Glu Ala Phe Arg Arg Phe Thr Pro Phe Asp Pro Thr 360 365 370 tca gag gcc cag aaa gcc tca gtg gcc ctg gcc ttc att ggg cag tcg 1748 Ser Glu Ala Gln Lys Ala Ser Val Ala Leu Ala Phe Ile Gly Gln Ser 375 380 385 gct ctg gat atc agg aag aaa ctt cag aga ctg gaa ggg tta cag gag 1796 Ala Leu Asp Ile Arg Lys Lys Leu Gln Arg Leu Glu Gly Leu Gln Glu 390 395 400 gct gag tta cgt gat cta gtg aga gag gca gag aag gtg tat tac aga 1844 Ala Glu Leu Arg Asp Leu Val Arg Glu Ala Glu Lys Val Tyr Tyr Arg 405 410 415 agg gag aca gaa gag gag aag gaa cag aga aaa gaa aag gag aga gaa 1892 Arg Glu Thr Glu Glu Glu Lys Glu Gln Arg Lys Glu Lys Glu Arg Glu 420 425 430 435 gaa agg gag gaa aga cgt gat aga cgg caa gag aag aat ttg act aag 1940 Glu Arg Glu Glu Arg Arg Asp Arg Arg Gln Glu Lys Asn Leu Thr Lys 440 445 450 atc ttg gcc gca gtg gtt gaa ggg aag agc agc agg gag aga gag aga 1988 Ile Leu Ala Ala Val Val Glu Gly Lys Ser Ser Arg Glu Arg Glu Arg 455 460 465 gat ttt agg aaa att agg tca ggc cct aga cag tca ggg aac ctg ggc 2036 Asp Phe Arg Lys Ile Arg Ser Gly Pro Arg Gln Ser Gly Asn Leu Gly 470 475 480 aat agg acc cca ctc gac aag gac cag tgt gcg tat tgt aaa gaa aaa 2084 Asn Arg Thr Pro Leu Asp Lys Asp Gln Cys Ala Tyr Cys Lys Glu Lys 485 490 495 gga cac tgg gca agg aac tgc ccc aag aag gga aac aaa gga ccg aag 2132 Gly His Trp Ala Arg Asn Cys Pro Lys Lys Gly Asn Lys Gly Pro Lys 500 505 510 515 gtc cta gct cta gaa gaa gat aaa gat tag ggg aga cgg ggt tcg gac 2180 Val Leu Ala Leu Glu Glu Asp Lys Asp Gly Arg Arg Gly Ser Asp 520 525 530 ccc ctc ccc gag ccc agg gta act ttg aag gtg gag ggg caa cca gtt 2228 Pro Leu Pro Glu Pro Arg Val Thr Leu Lys Val Glu Gly Gln Pro Val 535 540 545 gag ttc ctg gtt gat acc gga gcg gag cat tca gtg ctg cta caa cca 2276 Glu Phe Leu Val Asp Thr Gly Ala Glu His Ser Val Leu Leu Gln Pro 550 555 560 tta gga aaa cta aaa gaa aaa aaa tcc tgg gtg atg ggt gcc aca ggg 2324 Leu Gly Lys Leu Lys Glu Lys Lys Ser Trp Val Met Gly Ala Thr Gly 565 570 575 caa cgg cag tat cca tgg act acc cga aga acc gtt gac ttg gga gtg 2372 Gln Arg Gln Tyr Pro Trp Thr Thr Arg Arg Thr Val Asp Leu Gly Val 580 585 590 gga cgg gta acc cac tcg ttt ctg gtc atc cct gag tgc cca gta ccc 2420 Gly Arg Val Thr His Ser Phe Leu Val Ile Pro Glu Cys Pro Val Pro 595 600 605 610 ctt cta ggt aga gac tta ctg acc aag atg gga gct caa att tct ttt 2468 Leu Leu Gly Arg Asp Leu Leu Thr Lys Met Gly Ala Gln Ile Ser Phe 615 620 625 gaa caa gga aga cca gaa gtg tct gtg aat aac aaa ccc atc act gtg 2516 Glu Gln Gly Arg Pro Glu Val Ser Val Asn Asn Lys Pro Ile Thr Val 630 635 640 ttg acc ctc caa tta gat gat gaa tat cga cta tat tct ccc caa gta 2564 Leu Thr Leu Gln Leu Asp Asp Glu Tyr Arg Leu Tyr Ser Pro Gln Val 645 650 655 aag cct gat caa gat ata cag tcc tgg ttg gag cag ttt ccc caa gcc 2612 Lys Pro Asp Gln Asp Ile Gln Ser Trp Leu Glu Gln Phe Pro Gln Ala 660 665 670 tgg gca gaa acc gca ggg atg ggt ttg gca aag caa gtt ccc cca cag 2660 Trp Ala Glu Thr Ala Gly Met Gly Leu Ala Lys Gln Val Pro Pro Gln 675 680 685 690 gtt att caa ctg aag gcc agt gct aca cca gta tca gtc aga cag tac 2708 Val Ile Gln Leu Lys Ala Ser Ala Thr Pro Val Ser Val Arg Gln Tyr 695 700 705 ccc ttg agt aga gag gct cga gaa gga att tgg ccg cat gtt caa aga 2756 Pro Leu Ser Arg Glu Ala Arg Glu Gly Ile Trp Pro His Val Gln Arg 710 715 720 tta atc caa cag ggc atc cta gtt cct gtc caa tcc cct tgg aat act 2804 Leu Ile Gln Gln Gly Ile Leu Val Pro Val Gln Ser Pro Trp Asn Thr 725 730 735 ccc ctg cta ccg gtt agg aag cct ggg acc aat gat tat cga cca gta 2852 Pro Leu Leu Pro Val Arg Lys Pro Gly Thr Asn Asp Tyr Arg Pro Val 740 745 750 cag gac ttg aga gag gtc aat aaa agg gtg cag gac ata cac cca acg 2900 Gln Asp Leu Arg Glu Val Asn Lys Arg Val Gln Asp Ile His Pro Thr 755 760 765 770 gtc ccg aac cct tat aac ctc ttg agc gcc ctc ccg cct gaa cgg aac 2948 Val Pro Asn Pro Tyr Asn Leu Leu Ser Ala Leu Pro Pro Glu Arg Asn 775 780 785 tgg tac aca gta ttg gac tta aaa gat gcc ttc ttc tgc ctg aga tta 2996 Trp Tyr Thr Val Leu Asp Leu Lys Asp Ala Phe Phe Cys Leu Arg Leu 790 795 800 cac ccc act agc caa cca ctt ttt gcc ttc gaa tgg aga gat cca ggt 3044 His Pro Thr Ser Gln Pro Leu Phe Ala Phe Glu Trp Arg Asp Pro Gly 805 810 815 acg gga aga acc ggg cag ctc acc tgg acc cga ctg ccc caa ggg ttc 3092 Thr Gly Arg Thr Gly Gln Leu Thr Trp Thr Arg Leu Pro Gln Gly Phe 820 825 830 aag aac tcc ccg acc atc ttt gac gaa gcc cta cac agg gac ctg gcc 3140 Lys Asn Ser Pro Thr Ile Phe Asp Glu Ala Leu His Arg Asp Leu Ala 835 840 845 850 aac ttc agg atc caa cac cct cag gtg acc ctc ctc cag tac gtg gat 3188 Asn Phe Arg Ile Gln His Pro Gln Val Thr Leu Leu Gln Tyr Val Asp 855 860 865 gac ctg ctt ctg gcg gga gcc acc aaa cag gac tgc tta gaa ggt acg 3236 Asp Leu Leu Leu Ala Gly Ala Thr Lys Gln Asp Cys Leu Glu Gly Thr 870 875 880 aag gca cta ctg ctg gaa ttg tct gac cta ggc tac aga gcc tct gct 3284 Lys Ala Leu Leu Leu Glu Leu Ser Asp Leu Gly Tyr Arg Ala Ser Ala 885 890 895 aag aag gcc cag att tgc agg aga gag gta aca tac ttg ggg tac agt 3332 Lys Lys Ala Gln Ile Cys Arg Arg Glu Val Thr Tyr Leu Gly Tyr Ser 900 905 910 ttg cgg ggc ggg cag cga tgg ctg acg gag gca cgg aag aaa act gta 3380 Leu Arg Gly Gly Gln Arg Trp Leu Thr Glu Ala Arg Lys Lys Thr Val 915 920 925 930 gtc cag ata ccg gcc cca acc aca gcc aaa caa gtg aga gag ttt ttg 3428 Val Gln Ile Pro Ala Pro Thr Thr Ala Lys Gln Val Arg Glu Phe Leu 935 940 945 ggg aca gct gga ttt tgc aga ctg tgg atc ccg ggg ttt gcg acc tta 3476 Gly Thr Ala Gly Phe Cys Arg Leu Trp Ile Pro Gly Phe Ala Thr Leu 950 955 960 gca gcc cca ctc tac ccg cta acc aaa gaa aaa ggg gga ttc tcc tgg 3524 Ala Ala Pro Leu Tyr Pro Leu Thr Lys Glu Lys Gly Gly Phe Ser Trp 965 970 975 gct cct gag cac cag aag gca ttt gat gct atc aaa aag gcc ctg ctg 3572 Ala Pro Glu His Gln Lys Ala Phe Asp Ala Ile Lys Lys Ala Leu Leu 980 985 990 agc gca cct gct ctg gcc ctc cct gac gta act aaa ccc ttt acc 3617 Ser Ala Pro Ala Leu Ala Leu Pro Asp Val Thr Lys Pro Phe Thr 995 1000 1005 ctt tat gtg gat gag cgt aag gga gta gcc cga gga gtt tta acc 3662 Leu Tyr Val Asp Glu Arg Lys Gly Val Ala Arg Gly Val Leu Thr 1010 1015 1020 caa acc cta gga cca tgg agg aga cct gtt gcc tac ctg tca aag 3707 Gln Thr Leu Gly Pro Trp Arg Arg Pro Val Ala Tyr Leu Ser Lys 1025 1030 1035 aag ctt gat cct gta gcc agt ggt tgg ccc gta tgt ctg aag gct 3752 Lys Leu Asp Pro Val Ala Ser Gly Trp Pro Val Cys Leu Lys Ala 1040 1045 1050 atc gca gct gtg gcc ata ctg gtc aag gac gct gac aaa ttg act 3797 Ile Ala Ala Val Ala Ile Leu Val Lys Asp Ala Asp Lys Leu Thr 1055 1060 1065 ttg gga cag aat ata act gta ata gcc ccc cat gca ttg gag aac 3842 Leu Gly Gln Asn Ile Thr Val Ile Ala Pro His Ala Leu Glu Asn 1070 1075 1080 atc gtt cgg cag ccc cca gac cga tgg atg acc aac gcc cgc atg 3887 Ile Val Arg Gln Pro Pro Asp Arg Trp Met Thr Asn Ala Arg Met 1085 1090 1095 acc cac tat caa agc ctg ctt ctc aca gag agg gtc act ttc gct 3932 Thr His Tyr Gln Ser Leu Leu Leu Thr Glu Arg Val Thr Phe Ala 1100 1105 1110 cca cca gcc gct ctc aac cct gcc act ctt ctg cct gaa gag act 3977 Pro Pro Ala Ala Leu Asn Pro Ala Thr Leu Leu Pro Glu Glu Thr 1115 1120 1125 gat gaa cca gtg act cat gat tgc cat caa cta ttg att gag gag 4022 Asp Glu Pro Val Thr His Asp Cys His Gln Leu Leu Ile Glu Glu 1130 1135 1140 act ggg gtc cgc aag gac ctt aca gac ata ccg ctg act gga gaa 4067 Thr Gly Val Arg Lys Asp Leu Thr Asp Ile Pro Leu Thr Gly Glu 1145 1150 1155 gtg cta acc tgg ttc act gac gga agc agc tat gtg gtg gaa ggt 4112 Val Leu Thr Trp Phe Thr Asp Gly Ser Ser Tyr Val Val Glu Gly 1160 1165 1170 aag agg atg gct ggg gcg gca gtg gtg gac ggg acc cgc acg atc 4157 Lys Arg Met Ala Gly Ala Ala Val Val Asp Gly Thr Arg Thr Ile 1175 1180 1185 tgg gcc agc agc ctg ccg gaa gga act tca gcg caa aag gct gag 4202 Trp Ala Ser Ser Leu Pro Glu Gly Thr Ser Ala Gln Lys Ala Glu 1190 1195 1200 ctc atg gcc ctc acg caa gct ttg cgg ctg gcc gaa ggg aaa tcc 4247 Leu Met Ala Leu Thr Gln Ala Leu Arg Leu Ala Glu Gly Lys Ser 1205 1210 1215 ata aac att tat acg gac agc agg tat gcc ttt gcg act gca cac 4292 Ile Asn Ile Tyr Thr Asp Ser Arg Tyr Ala Phe Ala Thr Ala His 1220 1225 1230 gta cac ggg gcc atc tat aaa caa agg ggg ttg ctt acc tca gca 4337 Val His Gly Ala Ile Tyr Lys Gln Arg Gly Leu Leu Thr Ser Ala 1235 1240 1245 ggg agg gaa ata aag aac aaa gag gaa att cta agc cta tta gaa 4382 Gly Arg Glu Ile Lys Asn Lys Glu Glu Ile Leu Ser Leu Leu Glu 1250 1255 1260 gcc tta cat ttg cca aaa agg cta gct att ata cac tgt cct gga 4427 Ala Leu His Leu Pro Lys Arg Leu Ala Ile Ile His Cys Pro Gly 1265 1270 1275 cat cag aaa gcc aaa gat ctc ata tct aga ggg aac cag atg gct 4472 His Gln Lys Ala Lys Asp Leu Ile Ser Arg Gly Asn Gln Met Ala 1280 1285 1290 gac cgg gtt gcc aag cag gca gcc cag gct gtt aac ctt ctg cct 4517 Asp Arg Val Ala Lys Gln Ala Ala Gln Ala Val Asn Leu Leu Pro 1295 1300 1305 ata ata gaa acg ccc aaa gcc cca gaa ccc aga cga cag tac acc 4562 Ile Ile Glu Thr Pro Lys Ala Pro Glu Pro Arg Arg Gln Tyr Thr 1310 1315 1320 cta gaa gac tgg caa gag ata aaa aag ata gac cag ttc tct gag 4607 Leu Glu Asp Trp Gln Glu Ile Lys Lys Ile Asp Gln Phe Ser Glu 1325 1330 1335 act ccg gag ggg acc tgc tat acc tca tat ggg aag gaa atc ctg 4652 Thr Pro Glu Gly Thr Cys Tyr Thr Ser Tyr Gly Lys Glu Ile Leu 1340 1345 1350 ccc cac aaa gaa ggg tta gaa tat gtc caa cag ata cat cgt cta 4697 Pro His Lys Glu Gly Leu Glu Tyr Val Gln Gln Ile His Arg Leu 1355 1360 1365 acc cac cta gga act aaa cac ctg cag cag ttg gtc aga aca tcc 4742 Thr His Leu Gly Thr Lys His Leu Gln Gln Leu Val Arg Thr Ser 1370 1375 1380 cct tat cat gtt ctg agg cta cca gga gtg gct gac tcg gtg gtc 4787 Pro Tyr His Val Leu Arg Leu Pro Gly Val Ala Asp Ser Val Val 1385 1390 1395 aaa cat tgt gtg ccc tgc cag ctg gtt aat gct aat cct tcc aga 4832 Lys His Cys Val Pro Cys Gln Leu Val Asn Ala Asn Pro Ser Arg 1400 1405 1410 ata cct cca gga aag aga cta agg gga agc cac cca ggc gct cac 4877 Ile Pro Pro Gly Lys Arg Leu Arg Gly Ser His Pro Gly Ala His 1415 1420 1425 tgg gaa gtg gac ttc act gag gta aag ccg gct aaa tac gga aac 4922 Trp Glu Val Asp Phe Thr Glu Val Lys Pro Ala Lys Tyr Gly Asn 1430 1435 1440 aaa tat cta ttg gtt ttt gta gac acc ttt tca gga tgg gta gag 4967 Lys Tyr Leu Leu Val Phe Val Asp Thr Phe Ser Gly Trp Val Glu 1445 1450 1455 gct tat cct act aag aaa gag act tca acc gtg gtg gct aag aaa 5012 Ala Tyr Pro Thr Lys Lys Glu Thr Ser Thr Val Val Ala Lys Lys 1460 1465 1470 ata ctg gag gaa att ttt cca aga ttt gga ata cct aag gta ata 5057 Ile Leu Glu Glu Ile Phe Pro Arg Phe Gly Ile Pro Lys Val Ile 1475 1480 1485 ggg tca gac aat ggt cca gct ttc gtt gcc cag gta agt cag gga 5102 Gly Ser Asp Asn Gly Pro Ala Phe Val Ala Gln Val Ser Gln Gly 1490 1495 1500 ctg gcc aag ata ttg ggg att gat tgg aaa ctg cat tgt gca tac 5147 Leu Ala Lys Ile Leu Gly Ile Asp Trp Lys Leu His Cys Ala Tyr 1505 1510 1515 aga ccc caa agc tca gga cag gta gag agg atg aat aga acc att 5192 Arg Pro Gln Ser Ser Gly Gln Val Glu Arg Met Asn Arg Thr Ile 1520 1525 1530 aaa gag acc ctt acc aaa ttg acc aca gag act ggc att aat gat 5237 Lys Glu Thr Leu Thr Lys Leu Thr Thr Glu Thr Gly Ile Asn Asp 1535 1540 1545 tgg atg gct ctc ctg ccc ttt gtg ctt ttt agg gtg agg aac acc 5282 Trp Met Ala Leu Leu Pro Phe Val Leu Phe Arg Val Arg Asn Thr 1550 1555 1560 cct gga cag ttt ggg ctg acc ccc tat gaa ttg ctc tac ggg gga 5327 Pro Gly Gln Phe Gly Leu Thr Pro Tyr Glu Leu Leu Tyr Gly Gly 1565 1570 1575 ccc ccc ccg ttg gca gaa att gcc ttt gca cat agt gct gat gtg 5372 Pro Pro Pro Leu Ala Glu Ile Ala Phe Ala His Ser Ala Asp Val 1580 1585 1590 ctg ctt tcc cag cct ttg ttc tct agg ctc aag gcg ctc gag tgg 5417 Leu Leu Ser Gln Pro Leu Phe Ser Arg Leu Lys Ala Leu Glu Trp 1595 1600 1605 gtg agg cag cga gcg tgg aag cag ctc cgg gag gcc tac tca gga 5462 Val Arg Gln Arg Ala Trp Lys Gln Leu Arg Glu Ala Tyr Ser Gly 1610 1615 1620 gga gac ttg caa gtt cca cat cgc ttc caa gtt gga gat tca gtc 5507 Gly Asp Leu Gln Val Pro His Arg Phe Gln Val Gly Asp Ser Val 1625 1630 1635 tat gtt aga cgc cac cgt gca gga aac ctc gag act cgg tgg aag 5552 Tyr Val Arg Arg His Arg Ala Gly Asn Leu Glu Thr Arg Trp Lys 1640 1645 1650 gga cct tat ctc gta ctt ttg acc aca cca acg gct gtg aaa gtc 5597 Gly Pro Tyr Leu Val Leu Leu Thr Thr Pro Thr Ala Val Lys Val 1655 1660 1665 gaa gga atc ccc acc tgg atc cat gca tcc cac gtt aag ccg gcg 5642 Glu Gly Ile Pro Thr Trp Ile His Ala Ser His Val Lys Pro Ala 1670 1675 1680 cca cct ccc gac tcg ggg tgg aga gcc gaa aag act gag aat ccc 5687 Pro Pro Pro Asp Ser Gly Trp Arg Ala Glu Lys Thr Glu Asn Pro 1685 1690 1695 ctt aag ctt cgc ctc cat cgc ctg gtt cct tac tct aac aat aac 5732 Leu Lys Leu Arg Leu His Arg Leu Val Pro Tyr Ser Asn Asn Asn 1700 1705 1710 tcc cca ggc cag tagtaaacgc cttatagaca gctcgaaccc ccatagacct 5784 Ser Pro Gly Gln 1715 ttatccctta cctggctgat tattgaccct gatacgggtg tcactgtaaa tagcactcga 5844 ggtgttgctc ctagaggcac ctggtggcct gaactgcatt tctgcctccg attgattaac 5904 cccgctgtta aaagcacacc tcccaaccta gtccgtagtt atgggttcta ttgctgccca 5964 ggcacagaga aagagaaata ctgtgggggt tctggggaat ccttctgtag gagatggagc 6024 tgcgtcacct ccaacgatgg agactggaaa tggccgatct ctctccagga ccgggtaaaa 6084 ttctcctttg tcaattccgg cccgggcaag tacaaaatga tgaaactata taaagataag 6144 agctgctccc catcagactt agattatcta aagataagtt tcactgaaag gaaaacagga 6204 aaatattcaa aagtggataa atggtatgag ctggggaata gttttttatt atatggcggg 6264 ggagcagggt ccactttaac cattcgcctt aggatagaga cggggacaga accccctgtg 6324 gcaatgggac ccgataaagt actggctgaa caggggcccc cggccctgga gccaccgcat 6384 aacttgccgg tgccccaatt aacctcgctg cggcctgaca taacacagcc gcctagcaac 6444 agtaccactg gattgattcc taccaacacg cctagaaact ccccaggtgt tcctgttaag 6504 acaggacaga gactcttcag tctcatccag ggagctttcc aagccatcaa ctccaccgac 6564 cctgatgcca cttcttcttg ttggctttgt ctatcctcag ggcctcctta ttatgagggg 6624 atggctaaag aaagaaaatt caatgtgacc aaagagcata gaaatcaatg tacatggggg 6684 tcccgaaata agcttaccct cactgaagtt tccgggaagg ggacatgcat aggaaaagct 6744 cccccatccc accaacacct ttgctatagt actgtggttt atgagcaggc ctcagaaaat 6804 cagtatttag tacctggtta taacaggtgg tgggcatgca atactgggtt aaccccctgt 6864 gtttccacct cagtcttcaa ccaatccaaa gatttctgtg tcatggtcca aatcgtcccc 6924 cgagtgtact accatcctga ggaagtggtc cttgatgaat atgactatcg gtataaccga 6984 ccaaaaagag aacccgtatc ccttacccta gctgtaatgc tcggattagg gacggccgtt 7044 ggcgtaggaa cagggacagc tgccctgatc acaggaccac agcagctaga gaaaggactt 7104 ggtgagctac atgcggccat gacagaagat ctccgagcct taaaggagtc tgttagcaac 7164 ctagaagagt ccctgacttc tttgtctgaa gtggttctac agaaccggag gggattagat 7224 ctgctgtttc taagagaagg tgggttatgt gcagccttaa aagaagaatg ttgcttctat 7284 gtagatcact caggagccat cagagactcc atgaacaagc ttagaaaaaa gttagagagg 7344 cgtcgaaggg aaagagaggc tgaccagggg tggtttgaag gatggttcaa caggtctcct 7404 tggatgacca ccctgctttc tgctctgacg gggcccctag tagtcctgct cctgttactt 7464 acagttgggc cttgcttaat taataggttt gttgcctttg ttagagaacg agtgagtgca 7524 gtccagatca tggtacttag gcaacagtac caaggccttc tgagccaagg agaaactgac 7584 ctctagcctt cccagttcta agattagaac tattaacaag acaagaagtg gggaatgaaa 7644 ggatgaaaat gcaacctaac cctcccagaa cccaggaagt taataaaaag ctctaaatgc 7704 ccccgaatta cagaccctgc tggctgccag taaataggta gaaggtcaca cttcctattg 7764 ttccagggcc tgctatcctg gcctaagtaa gataacagga aatgagttga ctaatcgctt 7824 atctggattc tgtaaaactg actggcacca tagaagaatt gattacacat tgacagccct 7884 agtgacctat ctcaactgca atctgtcact ctgcccagga gcccacgcag atgcggacct 7944 ccggagctat tttaaaatga ttggtccacg gagcgcgggc tctcgatatt ttaaaatgat 8004 tggtccatgg agcgcgggct ctcgatattt taaaatgatt ggtttgtgac gcacaggctt 8064 tgttgtgaac cccataaaag ctgtcccgat tccgcactcg gggccgcagt cctctacccc 8124 tgcgtggtgt acgactgtgg gccccagcgc gcttggaata aaaatcctct tgctgtttgc 8184 atcaaaaaaa aaaaaaaaaa aaaaa 8209 <210> SEQ ID NO 4 <211> LENGTH: 524 <212> TYPE: PRT <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 4 Met Gly Gln Thr Val Thr Thr Pro Leu Ser Leu Thr Leu Asp His Trp 1 5 10 15 Thr Glu Val Arg Ser Arg Ala His Asn Leu Ser Val Gln Val Lys Lys 20 25 30 Gly Pro Trp Gln Thr Phe Cys Ala Ser Glu Trp Pro Thr Phe Asp Val 35 40 45 Gly Trp Pro Ser Glu Gly Thr Phe Asn Ser Glu Ile Ile Leu Ala Val 50 55 60 Lys Ala Ile Ile Phe Gln Thr Gly Pro Gly Ser His Pro Asp Gln Glu 65 70 75 80 Pro Tyr Ile Leu Thr Trp Gln Asp Leu Ala Glu Asp Pro Pro Pro Trp 85 90 95 Val Lys Pro Trp Leu Asn Lys Pro Arg Lys Pro Gly Pro Arg Ile Leu 100 105 110 Ala Leu Gly Glu Lys Asn Lys His Ser Ala Glu Lys Val Glu Pro Ser 115 120 125 Ser Ser Tyr Leu Pro Arg Asp Arg Gly Ala Ala Asp Leu Ala Gly Thr 130 135 140 Pro Thr Cys Ser Pro Thr Pro Leu Ser Ser Thr Gly Cys Cys Glu Gly 145 150 155 160 Thr Ser Ala Pro Pro Gly Ala Pro Val Val Glu Gly Pro Ala Ala Gly 165 170 175 Thr Arg Ser Arg Arg Gly Ala Thr Pro Glu Arg Thr Asp Glu Ile Ala 180 185 190 Ile Leu Pro Leu Arg Thr Tyr Gly Pro Pro Met Pro Gly Gly Gln Leu 195 200 205 Gln Pro Leu Gln Tyr Trp Pro Phe Ser Ser Ala Asp Leu Tyr Asn Trp 210 215 220 Lys Thr Asn His Pro Pro Phe Ser Glu Asp Pro Gln Arg Leu Thr Gly 225 230 235 240 Leu Val Glu Ser Leu Met Phe Ser His Gln Pro Thr Trp Asp Asp Cys 245 250 255 Gln Gln Leu Leu Gln Thr Leu Phe Thr Thr Glu Glu Arg Glu Arg Ile 260 265 270 Leu Leu Glu Ala Arg Lys Asn Val Pro Gly Ala Asp Gly Arg Pro Thr 275 280 285 Gln Leu Gln Asn Glu Ile Asp Met Gly Phe Pro Leu Thr Arg Pro Gly 290 295 300 Trp Asp Tyr Asn Thr Ala Glu Gly Arg Glu Ser Leu Lys Ile Tyr Arg 305 310 315 320 Gln Ala Leu Val Ala Gly Leu Arg Gly Ala Ser Arg Arg Pro Thr Asn 325 330 335 Leu Ala Lys Val Arg Glu Val Met Gln Gly Pro Asn Glu Pro Pro Ser 340 345 350 Val Phe Leu Glu Arg Leu Met Glu Ala Phe Arg Arg Phe Thr Pro Phe 355 360 365 Asp Pro Thr Ser Glu Ala Gln Lys Ala Ser Val Ala Leu Ala Phe Ile 370 375 380 Gly Gln Ser Ala Leu Asp Ile Arg Lys Lys Leu Gln Arg Leu Glu Gly 385 390 395 400 Leu Gln Glu Ala Glu Leu Arg Asp Leu Val Arg Glu Ala Glu Lys Val 405 410 415 Tyr Tyr Arg Arg Glu Thr Glu Glu Glu Lys Glu Gln Arg Lys Glu Lys 420 425 430 Glu Arg Glu Glu Arg Glu Glu Arg Arg Asp Arg Arg Gln Glu Lys Asn 435 440 445 Leu Thr Lys Ile Leu Ala Ala Val Val Glu Gly Lys Ser Ser Arg Glu 450 455 460 Arg Glu Arg Asp Phe Arg Lys Ile Arg Ser Gly Pro Arg Gln Ser Gly 465 470 475 480 Asn Leu Gly Asn Arg Thr Pro Leu Asp Lys Asp Gln Cys Ala Tyr Cys 485 490 495 Lys Glu Lys Gly His Trp Ala Arg Asn Cys Pro Lys Lys Gly Asn Lys 500 505 510 Gly Pro Lys Val Leu Ala Leu Glu Glu Asp Lys Asp 515 520 <210> SEQ ID NO 5 <211> LENGTH: 1194 <212> TYPE: PRT <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 5 Gly Arg Arg Gly Ser Asp Pro Leu Pro Glu Pro Arg Val Thr Leu Lys 1 5 10 15 Val Glu Gly Gln Pro Val Glu Phe Leu Val Asp Thr Gly Ala Glu His 20 25 30 Ser Val Leu Leu Gln Pro Leu Gly Lys Leu Lys Glu Lys Lys Ser Trp 35 40 45 Val Met Gly Ala Thr Gly Gln Arg Gln Tyr Pro Trp Thr Thr Arg Arg 50 55 60 Thr Val Asp Leu Gly Val Gly Arg Val Thr His Ser Phe Leu Val Ile 65 70 75 80 Pro Glu Cys Pro Val Pro Leu Leu Gly Arg Asp Leu Leu Thr Lys Met 85 90 95 Gly Ala Gln Ile Ser Phe Glu Gln Gly Arg Pro Glu Val Ser Val Asn 100 105 110 Asn Lys Pro Ile Thr Val Leu Thr Leu Gln Leu Asp Asp Glu Tyr Arg 115 120 125 Leu Tyr Ser Pro Gln Val Lys Pro Asp Gln Asp Ile Gln Ser Trp Leu 130 135 140 Glu Gln Phe Pro Gln Ala Trp Ala Glu Thr Ala Gly Met Gly Leu Ala 145 150 155 160 Lys Gln Val Pro Pro Gln Val Ile Gln Leu Lys Ala Ser Ala Thr Pro 165 170 175 Val Ser Val Arg Gln Tyr Pro Leu Ser Arg Glu Ala Arg Glu Gly Ile 180 185 190 Trp Pro His Val Gln Arg Leu Ile Gln Gln Gly Ile Leu Val Pro Val 195 200 205 Gln Ser Pro Trp Asn Thr Pro Leu Leu Pro Val Arg Lys Pro Gly Thr 210 215 220 Asn Asp Tyr Arg Pro Val Gln Asp Leu Arg Glu Val Asn Lys Arg Val 225 230 235 240 Gln Asp Ile His Pro Thr Val Pro Asn Pro Tyr Asn Leu Leu Ser Ala 245 250 255 Leu Pro Pro Glu Arg Asn Trp Tyr Thr Val Leu Asp Leu Lys Asp Ala 260 265 270 Phe Phe Cys Leu Arg Leu His Pro Thr Ser Gln Pro Leu Phe Ala Phe 275 280 285 Glu Trp Arg Asp Pro Gly Thr Gly Arg Thr Gly Gln Leu Thr Trp Thr 290 295 300 Arg Leu Pro Gln Gly Phe Lys Asn Ser Pro Thr Ile Phe Asp Glu Ala 305 310 315 320 Leu His Arg Asp Leu Ala Asn Phe Arg Ile Gln His Pro Gln Val Thr 325 330 335 Leu Leu Gln Tyr Val Asp Asp Leu Leu Leu Ala Gly Ala Thr Lys Gln 340 345 350 Asp Cys Leu Glu Gly Thr Lys Ala Leu Leu Leu Glu Leu Ser Asp Leu 355 360 365 Gly Tyr Arg Ala Ser Ala Lys Lys Ala Gln Ile Cys Arg Arg Glu Val 370 375 380 Thr Tyr Leu Gly Tyr Ser Leu Arg Gly Gly Gln Arg Trp Leu Thr Glu 385 390 395 400 Ala Arg Lys Lys Thr Val Val Gln Ile Pro Ala Pro Thr Thr Ala Lys 405 410 415 Gln Val Arg Glu Phe Leu Gly Thr Ala Gly Phe Cys Arg Leu Trp Ile 420 425 430 Pro Gly Phe Ala Thr Leu Ala Ala Pro Leu Tyr Pro Leu Thr Lys Glu 435 440 445 Lys Gly Gly Phe Ser Trp Ala Pro Glu His Gln Lys Ala Phe Asp Ala 450 455 460 Ile Lys Lys Ala Leu Leu Ser Ala Pro Ala Leu Ala Leu Pro Asp Val 465 470 475 480 Thr Lys Pro Phe Thr Leu Tyr Val Asp Glu Arg Lys Gly Val Ala Arg 485 490 495 Gly Val Leu Thr Gln Thr Leu Gly Pro Trp Arg Arg Pro Val Ala Tyr 500 505 510 Leu Ser Lys Lys Leu Asp Pro Val Ala Ser Gly Trp Pro Val Cys Leu 515 520 525 Lys Ala Ile Ala Ala Val Ala Ile Leu Val Lys Asp Ala Asp Lys Leu 530 535 540 Thr Leu Gly Gln Asn Ile Thr Val Ile Ala Pro His Ala Leu Glu Asn 545 550 555 560 Ile Val Arg Gln Pro Pro Asp Arg Trp Met Thr Asn Ala Arg Met Thr 565 570 575 His Tyr Gln Ser Leu Leu Leu Thr Glu Arg Val Thr Phe Ala Pro Pro 580 585 590 Ala Ala Leu Asn Pro Ala Thr Leu Leu Pro Glu Glu Thr Asp Glu Pro 595 600 605 Val Thr His Asp Cys His Gln Leu Leu Ile Glu Glu Thr Gly Val Arg 610 615 620 Lys Asp Leu Thr Asp Ile Pro Leu Thr Gly Glu Val Leu Thr Trp Phe 625 630 635 640 Thr Asp Gly Ser Ser Tyr Val Val Glu Gly Lys Arg Met Ala Gly Ala 645 650 655 Ala Val Val Asp Gly Thr Arg Thr Ile Trp Ala Ser Ser Leu Pro Glu 660 665 670 Gly Thr Ser Ala Gln Lys Ala Glu Leu Met Ala Leu Thr Gln Ala Leu 675 680 685 Arg Leu Ala Glu Gly Lys Ser Ile Asn Ile Tyr Thr Asp Ser Arg Tyr 690 695 700 Ala Phe Ala Thr Ala His Val His Gly Ala Ile Tyr Lys Gln Arg Gly 705 710 715 720 Leu Leu Thr Ser Ala Gly Arg Glu Ile Lys Asn Lys Glu Glu Ile Leu 725 730 735 Ser Leu Leu Glu Ala Leu His Leu Pro Lys Arg Leu Ala Ile Ile His 740 745 750 Cys Pro Gly His Gln Lys Ala Lys Asp Leu Ile Ser Arg Gly Asn Gln 755 760 765 Met Ala Asp Arg Val Ala Lys Gln Ala Ala Gln Ala Val Asn Leu Leu 770 775 780 Pro Ile Ile Glu Thr Pro Lys Ala Pro Glu Pro Arg Arg Gln Tyr Thr 785 790 795 800 Leu Glu Asp Trp Gln Glu Ile Lys Lys Ile Asp Gln Phe Ser Glu Thr 805 810 815 Pro Glu Gly Thr Cys Tyr Thr Ser Tyr Gly Lys Glu Ile Leu Pro His 820 825 830 Lys Glu Gly Leu Glu Tyr Val Gln Gln Ile His Arg Leu Thr His Leu 835 840 845 Gly Thr Lys His Leu Gln Gln Leu Val Arg Thr Ser Pro Tyr His Val 850 855 860 Leu Arg Leu Pro Gly Val Ala Asp Ser Val Val Lys His Cys Val Pro 865 870 875 880 Cys Gln Leu Val Asn Ala Asn Pro Ser Arg Ile Pro Pro Gly Lys Arg 885 890 895 Leu Arg Gly Ser His Pro Gly Ala His Trp Glu Val Asp Phe Thr Glu 900 905 910 Val Lys Pro Ala Lys Tyr Gly Asn Lys Tyr Leu Leu Val Phe Val Asp 915 920 925 Thr Phe Ser Gly Trp Val Glu Ala Tyr Pro Thr Lys Lys Glu Thr Ser 930 935 940 Thr Val Val Ala Lys Lys Ile Leu Glu Glu Ile Phe Pro Arg Phe Gly 945 950 955 960 Ile Pro Lys Val Ile Gly Ser Asp Asn Gly Pro Ala Phe Val Ala Gln 965 970 975 Val Ser Gln Gly Leu Ala Lys Ile Leu Gly Ile Asp Trp Lys Leu His 980 985 990 Cys Ala Tyr Arg Pro Gln Ser Ser Gly Gln Val Glu Arg Met Asn Arg 995 1000 1005 Thr Ile Lys Glu Thr Leu Thr Lys Leu Thr Thr Glu Thr Gly Ile Asn 1010 1015 1020 Asp Trp Met Ala Leu Leu Pro Phe Val Leu Phe Arg Val Arg Asn Thr 1025 1030 1035 1040 Pro Gly Gln Phe Gly Leu Thr Pro Tyr Glu Leu Leu Tyr Gly Gly Pro 1045 1050 1055 Pro Pro Leu Ala Glu Ile Ala Phe Ala His Ser Ala Asp Val Leu Leu 1060 1065 1070 Ser Gln Pro Leu Phe Ser Arg Leu Lys Ala Leu Glu Trp Val Arg Gln 1075 1080 1085 Arg Ala Trp Lys Gln Leu Arg Glu Ala Tyr Ser Gly Gly Asp Leu Gln 1090 1095 1100 Val Pro His Arg Phe Gln Val Gly Asp Ser Val Tyr Val Arg Arg His 1105 1110 1115 1120 Arg Ala Gly Asn Leu Glu Thr Arg Trp Lys Gly Pro Tyr Leu Val Leu 1125 1130 1135 Leu Thr Thr Pro Thr Ala Val Lys Val Glu Gly Ile Pro Thr Trp Ile 1140 1145 1150 His Ala Ser His Val Lys Pro Ala Pro Pro Pro Asp Ser Gly Trp Arg 1155 1160 1165 Ala Glu Lys Thr Glu Asn Pro Leu Lys Leu Arg Leu His Arg Leu Val 1170 1175 1180 Pro Tyr Ser Asn Asn Asn Ser Pro Gly Gln 1185 1190 <210> SEQ ID NO 6 <211> LENGTH: 656 <212> TYPE: PRT <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 6 Met His Pro Thr Leu Ser Arg Arg His Leu Pro Thr Arg Gly Gly Glu 1 5 10 15 Pro Lys Arg Leu Arg Ile Pro Leu Ser Phe Ala Ser Ile Ala Trp Phe 20 25 30 Leu Thr Leu Thr Ile Thr Pro Gln Ala Ser Ser Lys Arg Leu Ile Asp 35 40 45 Ser Ser Asn Pro His Arg Pro Leu Ser Leu Thr Trp Leu Ile Ile Asp 50 55 60 Pro Asp Thr Gly Val Thr Val Asn Ser Thr Arg Gly Val Ala Pro Arg 65 70 75 80 Gly Thr Trp Trp Pro Glu Leu His Phe Cys Leu Arg Leu Ile Asn Pro 85 90 95 Ala Val Lys Ser Thr Pro Pro Asn Leu Val Arg Ser Tyr Gly Phe Tyr 100 105 110 Cys Cys Pro Gly Thr Glu Lys Glu Lys Tyr Cys Gly Gly Ser Gly Glu 115 120 125 Ser Phe Cys Arg Arg Trp Ser Cys Val Thr Ser Asn Asp Gly Asp Trp 130 135 140 Lys Trp Pro Ile Ser Leu Gln Asp Arg Val Lys Phe Ser Phe Val Asn 145 150 155 160 Ser Gly Pro Gly Lys Tyr Lys Met Met Lys Leu Tyr Lys Asp Lys Ser 165 170 175 Cys Ser Pro Ser Asp Leu Asp Tyr Leu Lys Ile Ser Phe Thr Glu Arg 180 185 190 Lys Thr Gly Lys Tyr Ser Lys Val Asp Lys Trp Tyr Glu Leu Gly Asn 195 200 205 Ser Phe Leu Leu Tyr Gly Gly Gly Ala Gly Ser Thr Leu Thr Ile Arg 210 215 220 Leu Arg Ile Glu Thr Gly Thr Glu Pro Pro Val Ala Met Gly Pro Asp 225 230 235 240 Lys Val Leu Ala Glu Gln Gly Pro Pro Ala Leu Glu Pro Pro His Asn 245 250 255 Leu Pro Val Pro Gln Leu Thr Ser Leu Arg Pro Asp Ile Thr Gln Pro 260 265 270 Pro Ser Asn Ser Thr Thr Gly Leu Ile Pro Thr Asn Thr Pro Arg Asn 275 280 285 Ser Pro Gly Val Pro Val Lys Thr Gly Gln Arg Leu Phe Ser Leu Ile 290 295 300 Gln Gly Ala Phe Gln Ala Ile Asn Ser Thr Asp Pro Asp Ala Thr Ser 305 310 315 320 Ser Cys Trp Leu Cys Leu Ser Ser Gly Pro Pro Tyr Tyr Glu Gly Met 325 330 335 Ala Lys Glu Arg Lys Phe Asn Val Thr Lys Glu His Arg Asn Gln Cys 340 345 350 Thr Trp Gly Ser Arg Asn Lys Leu Thr Leu Thr Glu Val Ser Gly Lys 355 360 365 Gly Thr Cys Ile Gly Lys Ala Pro Pro Ser His Gln His Leu Cys Tyr 370 375 380 Ser Thr Val Val Tyr Glu Gln Ala Ser Glu Asn Gln Tyr Leu Val Pro 385 390 395 400 Gly Tyr Asn Arg Trp Trp Ala Cys Asn Thr Gly Leu Thr Pro Cys Val 405 410 415 Ser Thr Ser Val Phe Asn Gln Ser Lys Asp Phe Cys Val Met Val Gln 420 425 430 Ile Val Pro Arg Val Tyr Tyr His Pro Glu Glu Val Val Leu Asp Glu 435 440 445 Tyr Asp Tyr Arg Tyr Asn Arg Pro Lys Arg Glu Pro Val Ser Leu Thr 450 455 460 Leu Ala Val Met Leu Gly Leu Gly Thr Ala Val Gly Val Gly Thr Gly 465 470 475 480 Thr Ala Ala Leu Ile Thr Gly Pro Gln Gln Leu Glu Lys Gly Leu Gly 485 490 495 Glu Leu His Ala Ala Met Thr Glu Asp Leu Arg Ala Leu Lys Glu Ser 500 505 510 Val Ser Asn Leu Glu Glu Ser Leu Thr Ser Leu Ser Glu Val Val Leu 515 520 525 Gln Asn Arg Arg Gly Leu Asp Leu Leu Phe Leu Arg Glu Gly Gly Leu 530 535 540 Cys Ala Ala Leu Lys Glu Glu Cys Cys Phe Tyr Val Asp His Ser Gly 545 550 555 560 Ala Ile Arg Asp Ser Met Asn Lys Leu Arg Lys Lys Leu Glu Arg Arg 565 570 575 Arg Arg Glu Arg Glu Ala Asp Gln Gly Trp Phe Glu Gly Trp Phe Asn 580 585 590 Arg Ser Pro Trp Met Thr Thr Leu Leu Ser Ala Leu Thr Gly Pro Leu 595 600 605 Val Val Leu Leu Leu Leu Leu Thr Val Gly Pro Cys Leu Ile Asn Arg 610 615 620 Phe Val Ala Phe Val Arg Glu Arg Val Ser Ala Val Gln Ile Met Val 625 630 635 640 Leu Arg Gln Gln Tyr Gln Gly Leu Leu Ser Gln Gly Glu Thr Asp Leu 645 650 655 <210> SEQ ID NO 7 <211> LENGTH: 18 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial Sequence: Oligonucleotide designed against Porcine retrovirus genome <400> SEQUENCE: 7 ggaagtggac ttcactga 18 <210> SEQ ID NO 8 <211> LENGTH: 18 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial Sequence: Oligonucleotide designed against Porcine retrovirus genome <400> SEQUENCE: 8 ctttccaccc cgaatcgg 18 <210> SEQ ID NO 9 <211> LENGTH: 2956 <212> TYPE: DNA <213> ORGANISM: Unknown Organism <220> FEATURE: <223> OTHER INFORMATION: Description of Unknown Organism: Genomic “Raji” clone DNA ENV region <400> SEQUENCE: 9 tgctttttag ggttaggaac acccctggac agtttgggct gaccccctat gaattgctct 60 acgggggacc ccccccgttg gtagaaattg cttctgtaca tagtgctgat gtgctgcttt 120 cccagccttt gttctctagg ctcaaggcgc tcgagtgggt gaggcaacga gcgtggaagc 180 agctccggga ggcctactca ggagagagag acttgcaagt tccacatcgc ttccaagttg 240 gagattcagt ctatgttaga cgccaccgtg caggaaacct cgagactcgg tggaagggac 300 cttatctcgt acttttgacc acaccaacgg ctgtgaaagt cgaaggaatc tccacctgga 360 tccatgcatc ccacgttaag ctggcgccac ctcccgactc ggggtggaga gccgaaaaga 420 ctgagaatcc ccttaagctt cgcctccatc gcctggttcc ttactctaac aataactccc 480 caggccagta gtaaacgcct tatagacagc tcgaaccccc atagaccttt atcccctacc 540 tggctgatta ttgaccctga tacgggtgtc actgtaaata gcactcgagg tgttgctcct 600 agaggcacct ggtggcctga actgcatttc tgcctccgat tgattaaccc cgctgttaaa 660 agcacacctc ccaacctagt ccgtagttat gggttctatt gctgcccagg cacagagaaa 720 gagaaatact gtgggggttc tggggaatcc ttctgtagga gatggagctg cgtcacctcc 780 aacgatggag actggaaatg gccgatctct ctccaggacc gggtaaaatt ctcctttgtc 840 aattccggcc cgggcaagta caaaatgatg aaactatata aagataagag ctgctcccca 900 tcagacttag attatctaaa gataagtttc actgaaaaag gaaaacagga aaatattcaa 960 aagtggataa atggtatgag ctggggaata gttttttaat aatatggcgg gggagcaggg 1020 tccactttaa ccattcgcct taggatagag acggggacag aaccccctgt ggcaatggga 1080 cccgataaag tactggctga acaggggccc ccggccctgg agccaccgca taacttgccg 1140 gtgccccaat taacctcgct gcggcctgac ataacacagc cgcctagcaa cagtaccact 1200 ggattgattc ctaccaacac gcctagaaac tccccaggtg ttcctgttaa gacaggacag 1260 agactcttca gtctcatcca gggagctttc caagccatca actccaccga ccctgatgcc 1320 acttcttctt gttggctttg tctatcctca gggcctcctt attatgaggg gatggctaaa 1380 gaaagaaaat tcaatgtgac caaagagcat agaaatcaat gtacatgggg gtcccgaaat 1440 aagcttaccc tcactgaagt ttccgggaag gggacatgca taggaaaagc tcccccatcc 1500 caccaacacc tttgctatag tactgtggtt tatgagcagg cctcagaaaa tcagtattta 1560 gtacctggtt ataacaggtg gtgggcatgc aatactgggt taaccccctg tgtttccacc 1620 tcagtcttca accaatccaa agatttgtgt gtcatggtcc aaatcgtccc ccgagtgtac 1680 taccatcctg aggaagtggt ccttgatgaa tatgactatc ggtataaccg accaaaaaga 1740 gaacccgtat cccttaccct agctgtaatg ctcggattag ggacggccgt tggcgtagga 1800 acagggacag ctgccctgat cacaggacca cagcagctag agaaaggact tggtgagcta 1860 catgcggcca tgacagaaga tctccgagcc ttaaaggagt ctgttagcaa cctagaagag 1920 tccctgactt ctttgtctga agtggttcta cagaaccgga ggggattaga tctgctgttt 1980 ctaagagaag gtgggttatg tgcagcctta aaagaagaat gttgcttcta tgtagatcac 2040 tcaggagcca tcagagactc catgaacaag cttagaaaaa agttagagag gcgtcgaagg 2100 gaaagagagg ctgaccaggg gtggtttgaa ggatggttca acaggtctcc ttggatgacc 2160 accctgcttt ctgctctgac ggggccccta gtagtcctgc tcctgttact tacagttggg 2220 ccttgcttaa ttaataggtt tgttgccttt gttagagaac gagtgagtgc agtccagatc 2280 atggtactta ggcaacagta ccaaggcctt ctgagccaag gagaaactga cctctagcct 2340 tcccagttct aagattagaa ctattaacaa gacaagaagt ggggaatgaa aggatgaaaa 2400 tgcaacctaa ccctcccaga acccaggaag ttaataaaaa gctctaaatg cccccgaatt 2460 acagaccctg ctggctgcca gtaaataggt agaaggtcac acttcctatt gttccagggc 2520 ctgctatcct ggcctaagta agataacagg aaatgagttg actaatcgct tatctggatt 2580 ctgtaaaact gactggcacc atagaagaat tgattacaca ttgacagccc tagtgaccta 2640 tctcaactgc aatctgtcac tctgcccagg agcccacgca gatgcggacc tccggagcta 2700 ttttaaaatg attggtccac ggagcgcggg ctctcgatat tttaaaatga ttggtccatg 2760 gagcgcgggc tctcgatatt ttaaaatgat tggtttgtga cgcacaggct ttgttgtgaa 2820 ccccataaaa gctgtcccga ttccgcactc ggggccgcag tcctctaccc ctgcgtggtg 2880 tacgactgtg ggccccagcg cgcttggaat aaaaatcctc ttgctgtttg catcaaaaaa 2940 aaaaaaaaaa aaaaaa 2956 <210> SEQ ID NO 10 <211> LENGTH: 657 <212> TYPE: PRT <213> ORGANISM: Unknown Organism <220> FEATURE: <223> OTHER INFORMATION: Description of Unknown Organism: Amino acid sequence of ENV region “Raji” <400> SEQUENCE: 10 Met His Pro Thr Leu Ser Trp Arg His Leu Pro Thr Arg Gly Gly Glu 1 5 10 15 Pro Lys Arg Leu Arg Ile Pro Leu Ser Phe Ala Ser Ile Ala Trp Phe 20 25 30 Leu Thr Leu Thr Ile Thr Pro Gln Ala Ser Ser Lys Arg Leu Ile Asp 35 40 45 Ser Ser Asn Pro His Arg Pro Leu Ser Pro Thr Trp Leu Ile Ile Asp 50 55 60 Pro Asp Thr Gly Val Thr Val Asn Ser Thr Arg Gly Val Ala Pro Arg 65 70 75 80 Gly Thr Trp Trp Pro Glu Leu His Phe Cys Leu Arg Leu Ile Asn Pro 85 90 95 Ala Val Lys Ser Thr Pro Pro Asn Leu Val Arg Ser Tyr Gly Phe Tyr 100 105 110 Cys Cys Pro Gly Thr Glu Lys Glu Lys Tyr Cys Gly Gly Ser Gly Glu 115 120 125 Ser Phe Cys Arg Arg Trp Ser Cys Val Thr Ser Asn Asp Gly Asp Trp 130 135 140 Lys Trp Pro Ile Ser Leu Gln Asp Arg Val Lys Phe Ser Phe Val Asn 145 150 155 160 Ser Gly Pro Gly Lys Tyr Lys Met Met Lys Leu Tyr Lys Asp Lys Ser 165 170 175 Cys Ser Pro Ser Asp Leu Asp Tyr Leu Lys Ile Ser Phe Thr Glu Lys 180 185 190 Gly Lys Gln Glu Asn Ile Gln Lys Trp Ile Asn Gly Met Ser Trp Gly 195 200 205 Ile Val Phe Tyr Lys Tyr Gly Gly Gly Ala Gly Ser Thr Leu Thr Ile 210 215 220 Arg Leu Arg Ile Glu Thr Gly Thr Glu Pro Pro Val Ala Met Gly Pro 225 230 235 240 Asp Lys Val Leu Ala Glu Gln Gly Pro Pro Ala Leu Glu Pro Pro His 245 250 255 Asn Leu Pro Val Pro Gln Leu Thr Ser Leu Arg Pro Asp Ile Thr Gln 260 265 270 Pro Pro Ser Asn Ser Thr Thr Gly Leu Ile Pro Thr Asn Thr Pro Arg 275 280 285 Asn Ser Pro Gly Val Pro Val Lys Thr Gly Gln Arg Leu Phe Ser Leu 290 295 300 Ile Gln Gly Ala Phe Gln Ala Ile Asn Ser Thr Asp Pro Asp Ala Thr 305 310 315 320 Ser Ser Cys Trp Leu Cys Leu Ser Ser Gly Pro Pro Tyr Tyr Glu Gly 325 330 335 Met Ala Lys Glu Arg Lys Phe Asn Val Thr Lys Glu His Arg Asn Gln 340 345 350 Cys Thr Trp Gly Ser Arg Asn Lys Leu Thr Leu Thr Glu Val Ser Gly 355 360 365 Lys Gly Thr Cys Ile Gly Lys Ala Pro Pro Ser His Gln His Leu Cys 370 375 380 Tyr Ser Thr Val Val Tyr Glu Gln Ala Ser Glu Asn Gln Tyr Leu Val 385 390 395 400 Pro Gly Tyr Asn Arg Trp Trp Ala Cys Asn Thr Gly Leu Thr Pro Cys 405 410 415 Val Ser Thr Ser Val Phe Asn Gln Ser Lys Asp Leu Cys Val Met Val 420 425 430 Gln Ile Val Pro Arg Val Tyr Tyr His Pro Glu Glu Val Val Leu Asp 435 440 445 Glu Tyr Asp Tyr Arg Tyr Asn Arg Pro Lys Arg Glu Pro Val Ser Leu 450 455 460 Thr Leu Ala Val Met Leu Gly Leu Gly Thr Ala Val Gly Val Gly Thr 465 470 475 480 Gly Thr Ala Ala Leu Ile Thr Gly Pro Gln Gln Leu Glu Lys Gly Leu 485 490 495 Gly Glu Leu His Ala Ala Met Thr Glu Asp Leu Arg Ala Leu Lys Glu 500 505 510 Ser Val Ser Asn Leu Glu Glu Ser Leu Thr Ser Leu Ser Glu Val Val 515 520 525 Leu Gln Asn Arg Arg Gly Leu Asp Leu Leu Phe Leu Arg Glu Gly Gly 530 535 540 Leu Cys Ala Ala Leu Lys Glu Glu Cys Cys Phe Tyr Val Asp His Ser 545 550 555 560 Gly Ala Ile Arg Asp Ser Met Asn Lys Leu Arg Lys Lys Leu Glu Arg 565 570 575 Arg Arg Arg Glu Arg Glu Ala Asp Gln Gly Trp Phe Glu Gly Trp Phe 580 585 590 Asn Arg Ser Pro Trp Met Thr Thr Leu Leu Ser Ala Leu Thr Gly Pro 595 600 605 Leu Val Val Leu Leu Leu Leu Leu Thr Val Gly Pro Cys Leu Ile Asn 610 615 620 Arg Phe Val Ala Phe Val Arg Glu Arg Val Ser Ala Val Gln Ile Met 625 630 635 640 Val Leu Arg Gln Gln Tyr Gln Gly Leu Leu Ser Gln Gly Glu Thr Asp 645 650 655 Leu <210> SEQ ID NO 11 <211> LENGTH: 20 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial Sequence: Oligonucleotide <400> SEQUENCE: 11 gatggctctc ctgccctttg 20 <210> SEQ ID NO 12 <211> LENGTH: 21 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial Sequence: Oligonucleotide <400> SEQUENCE: 12 cgatggaggc gaagcttaag g 21 <210> SEQ ID NO 13 <211> LENGTH: 20 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial Sequence: Primer <400> SEQUENCE: 13 gatggctctc ctgccctttg 20 <210> SEQ ID NO 14 <211> LENGTH: 18 <212> TYPE: DNA <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 14 ccacagtcgt acaccacg 18 <210> SEQ ID NO 15 <211> LENGTH: 9 <212> TYPE: PRT <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 15 Val Leu Ala Leu Glu Glu Asp Lys Asp 1 5 <210> SEQ ID NO 16 <211> LENGTH: 5 <212> TYPE: PRT <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 16 Arg Leu Gly Glu Thr 1 5 <210> SEQ ID NO 17 <211> LENGTH: 673 <212> TYPE: DNA <213> ORGANISM: Porcine retrovirus <400> SEQUENCE: 17 aagaagtggg gaatgaaagg atgaaaatgc aacctaaccc tcccagaacc caggaagtta 60 ataaaaagct ctaaatgccc ccgaattmca gaccctgctg gctgccagta aataggtaga 120 aggtcacact tcctattgtt ccagggcctg ctatcctggc ctaagtaaga taacaggaaa 180 tgagttgact aatcgcttat ctggattctg taaaactgac tggcaccata gaagaattga 240 ttacacattg acagccctag tgacctatct caactgcaat ctgtcactct gcccaggagc 300 ccacgcagat gcggacctcc ggagctattt taaaatgatt ggtccacgga gcgcgggctc 360 tcgatatttt aaaatgattg gtccatggag cgcgggctct cgatatttta aaatgattgg 420 tttgtgacgc acaggctttg ttgtgaaccc cataaaagct gtcccgattc cgcactcggg 480 gccgcagtcc tctacccctg cgtggtgtac gactgtgggc cccagcgcgc ttggaataaa 540 aatcctcttg ctgtttgcat caagaccgct tctygtgagt gatttggggt gtcgcctctt 600 ccgakcccgg acgaggggga ttgttctttt actggccttt catttggtgc gttggccggg 660 aaatcctgcg acc 673 

What is claimed is:
 1. An isolated polynucleotide fragment comprising: (a) a nucleotide sequence having nucleotides 5620 to 7590 of SEQ ID NO: 3; (b) a nucleotide sequence which has at least 95% sequence identity over its entire length to the sequence set forth in (a); or (c) a nucleotide sequence which is complementary to a nucleotide sequence set forth in (a) or (b); and wherein (a), (b) or (c) encodes an ENV polypeptide.
 2. An isolated polynucleotide fragment encoding for a polypeptide comprising the amino acid sequence set forth in SEQ ID NO: 6 or
 10. 3. An isolated polynucleotide fragment comprising a nucleotide sequence having nucleotides 5620 to 7590 of SEQ ID NO: 3, or a nucleotide sequence which is complementary thereto.
 4. A recombinant nucleic acid molecule comprising a polynucleotide fragment according to claim
 1. 5. A recombinant nucleic acid molecule according to claim 4 wherein the recombinant nucleic acid molecule comprises regulatory control sequences operably linked to said polynucleotide fragment for controlling expression of said polynucleotide fragment.
 6. A vector comprising a polynucleotide fragment according to claim
 1. 7. A vector according to claim 6, which is a virus or a plasmid.
 8. An isolated prokaryotio or eukaryotic host cell comprising a polynucleotide fragment according to claim
 1. 